One browser tab can run your whole server, and FileCat is the tab: a self-hosted web file manager that also serves as a lightweight server operations console. Browse, upload, download, and edit files with inline previews for images, video, and Markdown, then keep writing in a Typora-style WYSIWYG Markdown editor or sketch on the built-in Excalidraw whiteboard. Remote storage stops being remote: SFTP, S3, WebDAV, SMB shares, and Baidu Netdisk mount as ordinary local folders under the same operations, and your own directories publish back out over SMB, WebDAV, and SFTP for Windows Explorer and other clients. A web SSH terminal and in-browser RDP sessions reach servers and Windows desktops without separate tools, and the system dashboard watches CPU, memory, disk, and network in real time. Oversized log files open instantly, deep search digs through names and file contents with regex and filters, and custom command pipelines cover CI/CD routines across machines linked by the built-in network tunneling. An optional AI agent, connected to your own model API and reachable through chat platform bots, assists with operations and file tasks, and multi-user permissions with shareable download links decide who touches what. 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.