Outline is a modern, open-source knowledge base and team wiki designed for internal documentation. Built with React and Node.js, it offers a clean, distraction-free writing experience with real-time collaboration, Markdown editing, and a powerful search that makes finding information instant.

Originally created by the team at Jigsaw (a Google/Alphabet company), Outline has grown into a popular self-hosted alternative to Confluence and Notion for teams that want full control over their documentation. Its Docker-based deployment makes it straightforward to run on any server.

Key Features

• Real-time collaborative editing with Markdown support and slash commands
• Nested document collections with drag-and-drop organization
• Powerful full-text search with keyboard shortcuts (cmd+P)
• Integrations with Slack, Zapier, GitHub, and SSO providers
• Self-hosted Docker deployment with PostgreSQL backend

License: BSL 1.1

Platforms: Linux, Docker

GitHub Stars: 30k+

Website: https://www.getoutline.com/

Source Code: https://github.com/outline/outline

Use Cases

• Internal documentation — Company wikis, onboarding guides, and process documentation
• Engineering wikis — API documentation, architecture decisions, and runbooks
• Product specs — Collaborative product requirement documents and feature specifications
• Meeting notes — Searchable repository of team meeting notes and decisions

Alternatives

• BookStack — Simple, self-hosted documentation platform
• Docmost — Collaborative wiki alternative to Confluence/Notion
• Wiki.js — Modern wiki platform with Git-backed storage
• Documenso — Open source DocuSign alternative