Best open-source alternatives to Notion (2026)

An open-source, AI-powered workspace for notes, docs, wikis, and project tasks, positioned as an alternative to Notion.

Open-source, local-first all-in-one workspace combining docs, whiteboard canvas, and tables, positioned as an alternative to Notion and Miro.

Self-hosted, privacy-first personal knowledge workspace with block-level references, Markdown WYSIWYG editing, and AI agent collaboration.

Open-source, API-oriented low-code platform for building collaborative database-spreadsheet apps, an alternative to Airtable.

An open-source AI productivity workspace built on Cloudflare Workers, where agents build and share small personal apps with company context and guardrails.

A self-hosted, privacy-focused AI note-taking app built around quick card-style notes with Markdown and RAG search.

Official Electron desktop client for Anytype, a local-first, end-to-end encrypted personal knowledge base for macOS, Windows and Linux.

A self-hosted Rust knowledge base that builds a bitemporal knowledge graph from documents, so facts carry when they held and when the system learned them.

Open-source, local-first desktop AI workbench for reproducible scientific research, with agents, Python/R notebooks, and traceable artifacts.

A local-first markdown editor with WYSIWYG editing and side-by-side AI agent integration for knowledge bases, LLM wikis, and notes.

A set of 8 AI agents and 14 skills that manage an Obsidian vault through chat, covering notes, search, meetings, email, and calendar.

A self-hosted, offline-first knowledge base and wiki with an extended Markdown editor, team workspaces, OIDC SSO and S3 storage.

Self-hosted enterprise knowledge base that compiles company docs into a wiki and serves it to Claude and other LLMs via an MCP server with department-level access control.

A Claude Code, Codex, and OpenCode plugin that compiles research and sources into a persistent, Obsidian-compatible LLM-maintained knowledge base.

Local-first, markdown-based notes app for macOS, Windows, Linux, Android and iOS, with optional self-hosted or your-own-cloud sync.

A self-hosted notes app in a single Go binary, storing notes as Markdown files alongside a local SQLite database.

Self-hosted, open-source note-taking app with rich text and Markdown notes, task lists, diary, and revisions, deployed via Docker.

Open-source database and workspace where AI agents and people share structured records, docs, skills, and apps, with reviewed writes.