Before lifting a heavy four-unit storage server or rewiring a cramped network closet, you can map every unit of cabinet space in Rackula, an interactive drag-and-drop rack layout designer and capacity planner. Instead of staring at generic grey rectangles in a spreadsheet, you pull switches, routers, patch panels, UPS battery banks, and rackmount chassis from a hardware catalog populated with authentic front and rear faceplates from the NetBox device library. Equipment snaps cleanly to standard EIA-310 rack unit boundaries, while half-width gear and mini PCs nest inside one-unit carrier shelves and mounting brackets. Audiovisual technicians can group bayed cabinets side by side to plan amplifier racks, signal processor chains, and patch bays across multi-rack installations. Network engineers and data center operators can rearrange hardware with full undo and redo history, attach custom device graphics, and export crisp diagrams as PNG, SVG, or PDF files for runbooks and change control tickets. Sharing a proposed cabinet topology with a colleague in the field takes seconds using an encoded URL or a scannable QR code that opens on mobile browsers. Server-side persistence stores your rack definitions as portable YAML files and supports optional local accounts or OpenID Connect single sign-on for shared infrastructure teams. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

draw.io is a free, browser-based diagramming editor for flowcharts, network maps, UML models, and org charts, with nothing to install. An infinite canvas takes shapes from extensive libraries, connectors reroute automatically as shapes move, and ready-made templates replace the blank page. Tables, swimlanes, layers, and tags keep large diagrams tidy, and shape metadata and placeholders attach tooltips, links, and translations. Auto-layout straightens flowcharts and trees. Math typesetting, a simple whiteboard layout, and adaptive dark mode are built in, and custom shape libraries carry your own in-house icon sets. Export to PNG, JPEG, WebP, SVG, HTML, or PDF, embed the diagram data inside PNG and SVG files so they stay editable, or save the full diagram as a .drawio file. Your server stores no diagrams: files go to the user's device, the browser, or Google Drive, OneDrive, and GitLab once you register your own OAuth app. Optional AI diagram generation uses your own provider key, and environment variables set the interface language, fonts, and security policy. 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.