Among open-source Mailchimp alternatives, Keila has the most modern UI - built in Germany on Elixir and Phoenix (the PETAL stack), with GDPR-conscious defaults including an optional no-tracking mode, and 100% open source with no proprietary premium tier. Campaign authoring is flexible three ways: a visual block editor with multi-column layouts, Markdown with or without WYSIWYG for hybrid HTML-plus-plain- text sends, and raw MJML for hand-coded designs. The personalization system is unusually clean - every contact carries custom data as a single JSON object (populated from sign-up form fields or pushed from your CMS/CRM), and Shopify's Liquid template language renders it into fully dynamic emails. Targeting uses a visual segment editor backed by a powerful segment language for complex logic over tags, language preferences, and any custom field. Sign-up forms with custom fields grow your lists; open and click tracking measures campaigns; scheduled sending handles timing. Delivery pipes through your own SMTP or first-class integrations with AWS SES (including automated bounce handling), SendGrid, Mailgun, and Postmark. A full REST API manages contacts, campaigns, and segments, with Erlang/OTP reliability underneath. Comfortable at 100K+ subscribers. AGPL-licensed, EU-hosted project, actively developed.

Instead of running an Elasticsearch or Loki cluster, VictoriaLogs stores and searches your logs from a single zero-config server. Ship from Filebeat, Fluent Bit, Fluentd, Logstash, Vector, Promtail, Telegraf, the OpenTelemetry Collector, or the Datadog Agent. Syslog, journald, and Splunk endpoints work too. Query with LogsQL: word, phrase, and prefix filters combine with pipes that extract fields from raw lines and compute stats, top values, and facets. See results as a table, grouped by stream, as raw JSON, or as a live tail. Chart them in Grafana, or work from a terminal with vlogscli and pipe output into grep, less, or jq. Events with hundreds of fields are supported. So are high-cardinality fields like trace_id and user_id. Late, out-of-order backfills are accepted. During an incident, stream_context pulls the lines around any match. Tenants are keyed by AccountID and ProjectID headers. vmalert evaluates LogsQL queries as alerting and recording rules. CEF messages sent over Syslog are parsed automatically for SIEM work. Retention defaults to 7 days and can be capped by disk space. Per-day partitions snapshot and copy out with rsync or rclone. Cluster mode splits ingestion, querying, and storage across nodes for logs that outgrow one server. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache 2.0 licensed.

Website analytics, uptime monitoring, and server status - three tools most teams run separately - combined in Tianji, an open-source observability platform. The analytics layer tracks page views, unique visitors, referrers, and UTM parameters with a lightweight cookie-less script, which keeps collection GDPR and CCPA friendly. The uptime monitor checks availability and latency on configurable intervals, accepts passively reported results, and publishes public status pages for incident communication. Server status agents report CPU, memory, disk, and network metrics with threshold-based alerts, and notifications route through webhooks, Slack, Telegram, and other channels with noise control. It also includes anonymous telemetry for tracking deployments of your own open-source projects, surveys, waitlists, team collaboration, and an OpenAPI interface for integrations and exports. The consolidation is the point: traffic analytics, uptime checks, and server metrics share one interface and one alerting layer, so diagnosing an incident does not mean hopping between Google Analytics, Uptime Kuma, and Prometheus - and the built-in public status pages replace a separate paid Statuspage-style subscription. Because collection uses no cookies with IP truncation and aggregation by default, basic traffic measurement requires no consent banner. Built in TypeScript under the Apache 2.0 license and inspired by Umami and Uptime Kuma, it is deliberately right-sized for independent developers and small SaaS teams whose monitoring needs are real but lightweight.

Estimators, planners, and site teams work from one project record in OpenConstructionERP, a self-hosted construction workspace that carries a job from priced bill of quantities through tender, schedule, and site diary. The BOQ editor organizes sections, positions, and reusable assemblies with overhead, profit, VAT, and contingency markups, validates against DIN 276, NRM, and MasterFormat, and exports to PDF, Excel, CSV, or GAEB XML. Pricing draws on 120,000+ cost items across nine cost bases and a 7,000+ resource catalog, with regional price adjustment and semantic search. Quantities come from PDF plans measured on screen or from RVT, IFC, DWG, and DGN models; a 3D viewer filters elements and links them to BOQ positions, clash detection checks federated models, and an AI estimator drafts positions from text, photos, or drawings via the LLM you connect. Gantt schedules show dependencies and critical path, while earned value and S-curves track budget against actual. Tender comparison lines up subcontractor bids, and contracts, variations, and interim payment claims stay tied to the contract sum. On site, daily diaries with health and safety tracking, punch lists, and a carbon module totaling embodied emissions from the BOQ keep field work in the same system. The interface speaks 44 languages with right-to-left support, 293 guided cases teach real workflows on a demo project, and a REST API, webhooks, and module builder extend it. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.

Databasement puts scheduled backup and restore for nine database engines behind one polished web interface, deployed as a single Docker container on port 2226. The Laravel and Livewire backend uses native CLI tools for MySQL 5.6 through 9.x, PostgreSQL 12 through 18, MariaDB 10.x through 12.x, Microsoft SQL Server 2017 through Azure SQL, MongoDB 4.2 through 8.0, SQLite 3.x, Firebird 3.x through 5.x, Redis 2.8+, and Valkey 7.2+ with full restore support including cross-server recovery. SSH tunnel connectivity reaches databases behind firewalls via bastion servers with password or private key authentication, and remote agents handle isolated networks by connecting outbound over HTTPS without inbound ports. Scheduling supports arbitrary cron expressions with GFS grandfather-father-son retention alongside simple time-based cleanup. Storage spans local disk, S3-compatible services including AWS and MinIO, Azure Blob, Samba/SMB shares, and SFTP/FTP servers. Scheduled restores automate production-to-staging synchronization on recurring intervals. Failure notifications alert via Email, Slack, Discord, Telegram, Pushover, Gotify, and webhooks with detailed job logs. The REST API and built-in MCP server enable CI/CD pipeline integration and AI assistant access from Claude, Cursor, and VS Code Copilot. 1,700+ stars since November 2025. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

Tau delivers a complete self-hosted cloud platform where Git is the control plane and WebAssembly is the runtime. The Go binary deploys as interconnected nodes that form a P2P network using libp2p for automatic service discovery, eliminating Kubernetes entirely. Serverless functions compile to WebAssembly for secure multi-tenant execution with automatic horizontal scaling — write in Go, Rust, AssemblyScript, or C and deploy by pushing to Git. Branch-based environments map Git branches to isolated deployments, so staging and production run identical infrastructure from different refs. Static website hosting serves frontends with global distribution and automatic content-addressed deduplication via IPFS-derived storage. The built-in K/V database provides distributed storage with automatic replication across nodes, while object storage handles file management with content addressing. Pub/Sub messaging enables real-time communication between functions and external services including WebSocket support. Spore Drive automates multi-host deployment and rolling updates from a single command across bare metal or VMs running Ubuntu. The Dream CLI provides a complete local development environment that mirrors production exactly — same services, same routing, same deployment flow. Zero-configuration HTTPS provisions TLS certificates automatically for custom domains. The web console at console.taubyte.com provides visual project management, or use the tau CLI for Git-native workflows. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. BSD-3-Clause licensed.

A personal to-do list that scales to team project management: Vikunja is an open-source task manager that grows with the work. Every project can be viewed four ways - classic list, drag-and-drop Kanban board, Gantt chart for timeline planning, and a spreadsheet-style table - so a project manager watches the Gantt while developers work the board, on the same data. Tasks carry the full attribute set: labels, priorities, due dates and reminders, recurring schedules, subtasks and task relations, file attachments, assignees, and comments, and Quick Add Magic parses natural-language input like dates and labels typed inline. Projects share with team members or via links, and saved filters slice tasks across projects. Built-in CalDAV support (VTODO) syncs tasks bidirectionally with clients like Thunderbird, DAVx5, and iOS Reminders, and one-click importers migrate from Todoist, Trello, and Microsoft To-Do. Nothing is metered - unlimited projects, tasks, filters, and attachments. A single Go binary with a Vue frontend runs against SQLite, MySQL, or PostgreSQL, exposes a full REST API, and works as an installable PWA on mobile. AGPLv3-licensed.

Chitchatter is a browser-based chat room for text, voice, video, screen sharing, and file transfers that exists only while its members are connected and keeps no record of what was said. Every visit starts with a random room name generated on your device, a UUID or a readable passphrase, and you invite people with the link or a QR code. Public rooms admit anyone with the link; private rooms also require a matching password. Messages support Markdown, multiline text, and code blocks, and clicking a name opens a direct conversation. Newcomers to public rooms receive the earlier conversation from peers already there, and typing indicators show who is writing. Start an audio or video call, share your screen to walk a relative through a settings problem, or hand over a file of any size, encrypted before it leaves your browser. Public-key checks verify each peer automatically, with a green lock marking everyone who passes and an icon showing whether the link is direct or relayed. Embed a room in any web page with an iframe or a web component that takes a room name, user name, and color mode. Light and dark themes are built in, and notifications and sounds announce new messages while you work in another tab. Close the tab and the transcript disappears. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. GPL-2.0 licensed.

Whether operating from a home shack, a portable Parks on the Air activation, or a multi-operator club station, Wavelog gives amateur radio operators a browser-accessible logbook for recording and confirming QSO contacts from anywhere. Real-time transceiver frequency and mode data flow directly into the Live QSO logging interface from Hamlib, FLRig, and WSJT-X through the companion WavelogGate helper or REST API endpoints. An integrated DX Cluster and visual band waterfall display active spots filtered by continent, band, and DXCC status so operators can click a spot and QSY their rig immediately. Built-in two-way synchronization handles QSL confirmations and log uploads across Logbook of The World (LoTW), eQSL, QRZ.com, HRDLog, ClubLog, and the QO-100 DX Club alongside ADIF 3.1.8 and Cabrillo file imports and exports. Interactive Maidenhead grid maps, satellite pass tracking, and automated progress matrices for over 20 international awards (including DXCC, WAS, WAC, WAZ, IOTA, SOTA, POTA, and WWFF) show exactly which bands and modes still need confirmation. Dedicated contest logging windows and role-based club station permissions let teams work the same event simultaneously without log conflicts. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

Preventing silent link rot across research libraries, LinkAce captures, indexes, and permanently archives web discoveries into searchable multi-user collections with automated Wayback Machine snapshots. Curators bookmark articles, documentation, tools, and media using custom browser bookmarklets or quick-add input fields that automatically scrape page titles and metadata descriptions. The built-in link monitor continuously checks saved endpoints for HTTP status anomalies, alerting curators whenever destinations move, throw server errors, or vanish from the live internet. For long-term preservation, the system dispatches automated backup requests to the Internet Archive Wayback Machine to capture historical copies of critical research material. Curators organize their library using nested lists and granular tag hierarchies, switching seamlessly between compact tables, detailed reading feeds, and visual card layouts. Teams and households can create separate user accounts to collaborate on shared collections, delegating read-only or editing privileges per list. The platform also generates individualized RSS feeds for public or private bookmark streams, synchronizes external data through a tokenized REST API, and dispatches automated database dumps to AWS S3 storage buckets. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. GPL-3.0 licensed.

A complete WhatsApp Business Platform covering messaging, chatbot automation, and voice calling with IVR — a combination most self-hosted projects never attempt. The Fastglue/fasthttp backend processes WhatsApp Cloud API webhooks through PostgreSQL and Redis into a real-time WebSocket layer powering instant chat updates across a Vue 3 frontend built with shadcn-vue and TailwindCSS. Chatbot automation supports keyword triggers, multi-step conversation flows with branching logic, AI-powered responses from OpenAI, Anthropic, or Google models, knowledge base integration via vector stores, and seamless handoff to human agents when the bot gets stuck. The visual IVR builder uses a drag-and-drop node canvas where you wire greeting prompts, DTMF menu capture, HTTP callbacks to external APIs mid-call, business-hours routing by IANA timezone, agent team transfers with hold music, and reusable sub-flows. Every call recording streams encrypted to your S3-compatible bucket with retention you control. Multi-tenant architecture isolates organizations with separate data, roles, and API keys while a unified inbox presents both chat and call conversations to agents in a single dashboard. Meta-approved template management, bulk campaign messaging, analytics tracking, and a full REST API round out the platform. Deploy via Docker Compose with Postgres and Redis included. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL v3 licensed.

Instead of installing a different client for every database engine on your servers, Tabularis gives you one SQL workspace in the browser that speaks to PostgreSQL, MySQL, MariaDB, and SQLite directly, and to 26 more engines through installable driver plugins. The SQL editor autocompletes real table and column names as you type, runs multi-statement batches into separate result tabs, and can draw any result set as a bar or line chart. Notebooks mix executable SQL cells with Markdown and charts, sharing variables across cells for repeatable reports and investigations. You can edit rows inline in a virtualized grid that tracks pending changes before committing, build queries by dragging tables onto a canvas that writes the SQL for you, and generate an ER diagram from the live schema to see how everything connects. Natural-language prompts turn into SQL through OpenAI, Anthropic, Ollama, or any compatible endpoint you configure. Results export to CSV, JSON, or Markdown, whole databases dump to SQL files, and scheduled daily backups keep copies without manual effort. Connections reach databases through SSH or Kubernetes tunnels, and the built-in MCP server lets agents like Claude and Cursor inspect schemas and run queries under your control. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache-2.0 licensed.

Convert paper archives, email attachments, and PDF records into an organized digital repository with Docspell, an open-source document management system that automates optical character recognition, metadata extraction, and full-text search. Users can ingest receipts and invoices through network scanners, monitored IMAP email mailboxes, mobile uploads, or drag-and-drop browser tools. The background processing pipeline executes optical character recognition via Tesseract, enhances image contrast with unpaper, and extracts text from Word documents and PDFs. Machine learning algorithms analyze document syntax to predict correspondents, suggest relevant organization tags, and identify due dates automatically. Team members can search their entire filing cabinet using complex Boolean queries and full-text indexing powered by Apache Solr or PostgreSQL. Administrators can configure multi-user collectives with isolated permissions, define custom metadata attributes, set up webhooks, and share time-limited document download links. Users can also merge multi-page scans, track processing job queues, and export curated document collections for tax filings or legal audits. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. GNU AGPL v3.0 licensed.

Your users belong in your own database - Authorizer, an open-source authentication and authorization server shipping as a single Go binary, keeps them there. It connects to 13+ backends - PostgreSQL, MySQL, SQLite, SQL Server, MariaDB, MongoDB, Cassandra, ScyllaDB, ArangoDB, DynamoDB, Couchbase, YugabyteDB, PlanetScale, and CockroachDB - so identity data lives beside the application it protects instead of in an auth vendor's cloud. The server is fully OAuth 2.0 and OpenID Connect compliant, including authorization code flow with PKCE, a JWKS endpoint, token revocation, and nine JWT signing algorithms. Login options cover email/password, magic links, TOTP multi-factor, SMS OTP via Twilio, and social providers including Google, GitHub, Apple, Microsoft, and Discord. Authorization goes beyond roles: an embedded OpenFGA engine provides Zanzibar-style relationship-based permission checks in process. APIs are exposed over GraphQL, REST, and gRPC, with SDKs for JavaScript, React, Go, and Python, plus themeable built-in login pages and an admin dashboard. Apache 2.0 licensed.

Archestra delivers the enterprise AI infrastructure layer that organizations need when managing multiple LLM providers, MCP servers, and AI agents across teams becomes unmanageable. The LLM gateway routes requests across Anthropic, OpenAI, Azure, Bedrock, and DeepSeek with virtual API keys, per-team cost limits, and dynamic model routing — giving every developer one token for Claude Code, Cursor, or Codex while finance tracks spend per department. The MCP gateway authenticates tool calls with OAuth 2.1 and On-Behalf-Of tokens so each tool executes as the calling user, not a shared service account, eliminating credential sprawl. The private MCP registry lets teams publish custom tool servers with approval flows promoting servers from dev through staging to production, each environment maintaining its own credentials and network egress policies. The Kubernetes operator manages MCP server lifecycle — deploying containers, scaling, health-checking, and routing gateway traffic to local servers automatically. The agent runtime supports scheduled triggers, email and webhook invocations, sub-agent delegation, reusable skills, and sandboxed code execution with a K8s-native filesystem. Deterministic guardrails including Dual-LLM verification and Lethal Trifecta protections prevent dangerous tool calls before execution. Built-in OpenTelemetry traces and Prometheus metrics provide full observability without additional tooling. Docker deployment exposes the Admin UI on port 3000 and API on port 9000 with a single command. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.

Automating PostgreSQL backup lifecycles across local volumes and S3-compatible object storage, PG Back Web gives database administrators and developers a self-hosted web console to schedule, encrypt, monitor, download, and restore database dumps without writing manual shell scripts. Instead of maintaining fragile crontab entries across individual database servers, you register PostgreSQL 13, 14, 15, 16, 17, or 18 instances in one dashboard and define recurring backup schedules with custom retention policies and timezone-aware timestamps. Each backup execution can target local directories or multiple S3 buckets across providers like AWS S3, MinIO, Backblaze B2, and Cloudflare R2, with built-in connection testing and presigned download links for rapid archive retrieval. To protect sensitive production records at rest and in transit, the platform applies PGP encryption to dump files while encrypting stored database connection strings and bucket credentials. Real-time execution logs record exact archive sizes, durations, and output streams, and the web interface lets operators trigger on-demand dumps, duplicate existing backup jobs, or run direct browser-based restorations when disaster recovery is required. Automated background health checks continuously verify connectivity to every registered PostgreSQL database and storage destination, firing configurable HTTP webhooks to Slack, Discord, or incident pipelines whenever a backup completes, fails, or changes health status. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.

One binary is all that stands between you and every Kubernetes cluster you own: Kubewall opens a realtime web dashboard over all of them, with no agents to install and nothing phoning home. Switch between clusters from the sidebar and browse workloads, networking, storage, configuration, and access control in tables that update live as pods start, fail, and reschedule. Open any resource to inspect its overview, edit its manifest in the built-in YAML editor with validation, watch its events, or stream logs aggregated across pods and containers with search and tail controls. A command palette jumps straight to any resource type, while faceted filters and global search cut through thousands of objects by name, namespace, label, or image. Scale deployments, restart pods, trigger rollout restarts, and apply manifests with a click, or forward a cluster service to your local machine without memorising kubectl incantations. An integrated AI assistant, connected to OpenAI, Claude, Gemini, DeepSeek, OpenRouter, Ollama, or a local model, helps troubleshoot failures and review configurations right beside the resource it concerns. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache-2.0 licensed.

Capture every article you read, RSS feed you follow, X/Twitter thread you scroll past, and GitHub repository you star into one searchable, AI-enhanced personal knowledge base with Huntly. Auto-save visited web pages through the companion browser extension, extract distraction-free article text using Mozilla Readability and Defuddle, and highlight passages with inline notes that remain anchored in your library. Reconstruct multi-post X/Twitter threads automatically with embedded media preserved intact. Subscribe to RSS and Atom feeds via OPML import, organize subscriptions into custom folders, and triage unread stories alongside your read-it-later queue and hierarchical collections. Synchronize starred GitHub repositories with their README documentation and repository tags so you can filter tools by topic without leaving your dashboard. Run custom AI shortcuts to summarize long-form essays, translate foreign articles, or query your entire archive from external AI coding agents through the built-in MCP server and Agent Skills integration. Execute boolean, phrase, and bilingual fuzzy queries across every saved document or export your entire library to portable Markdown files. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache-2.0 licensed.