Show HN: OpenKnowledge – open source AI-first alternative to Obsidian/Notion

OpenKnowledge, an open-source, AI-first markdown editor and LLM wiki, launched as an alternative to Obsidian and Notion. The tool offers WYSIWYG editing, collaborative AI-editing with Claude and Codex, and team sharing via git/GitHub, available on macOS, Linux, and Windows.

OpenKnowledge is a beautiful, local-first markdown editor and LLM wiki with integrations for Claude, Codex, and other harnesses. Available as macOS app https://github.com/inkeep/open-knowledge/releases/latest/download/Open-Knowledge-arm64.dmg or Web app/CLI https://openknowledge.ai/docs/get-started/quickstart ok-install-web-app-linux-windows-intel-mac for Linux, Windows, Intel Mac. Key highlights: - Full WYSIWYG so that editing markdown files feels like editing a Google Doc or Notion page. - Collaborative AI-editing with Claude, Codex, and Cursor desktop apps . Can be used with any harness/agent via MCP/CLI. - Out-of-the-box MCP , skills , and agentic search for LLM Wikis, agent second brains, and spec-driven development. - No-code Team Sharing and Auto-sync powered by git/GitHub under the hood. Docs for general usage: https://openknowledge.ai/docs https://openknowledge.ai/docs . macOS: download the desktop app — open the DMG, drag OpenKnowledge to Applications , and launch it. Latest release https://github.com/inkeep/open-knowledge/releases/latest . Linux, Windows, Intel Mac: run the same editor as a local web app via the CLI Node.js 24+ https://nodejs.org required : npm install -g @inkeep/open-knowledge cd your-project ok init scaffold the project + wire up Claude Code, Cursor, and Codex ok start --open serve the web editor and open it in your browser Public pull requests are welcome. When a public PR opens here, automation mirrors it into the internal monorepo for review and merge. See CONTRIBUTING.md /inkeep/open-knowledge/blob/main/CONTRIBUTING.md for details. OpenKnowledge is licensed under the GNU General Public License v3.0 or later /inkeep/open-knowledge/blob/main/LICENSE GPL-3.0-or-later .