Open-source Notion alternative.

What it does

An open-source, local-first Notion alternative. Plain-Markdown notes that sync peer-to-peer, end-to-end encrypted with a Company Brain that answers across your workspace using the Claude Code you already run, or a fully-local model. No account, no cloud.

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  1CodeJan 2026 · github.com · ▲575

  Open source Cursor-like UI for Claude Code

• AO
  An open-source, collaborative, WYSIWYG Markdown editor2023 · editor.vrite.io · ▲460

  Inspired by the design and UI/UX of apps like Notion, and utility of open-source apps like StackEdit, I decided to create a minimalistic, local-only WYSIWYG Markdown editor. Some features worth highlighting: - Monaco editor and Prettier integration for code snippets - Tables (apparently the holy grail of WYSIWYG editing) - Embeds (for CodePen, CodeSandbox and YouTube, most useful for HTML or JSON exports) - Accepts Markdown paste-in, and "exports"/generates HTML, Markdown and JSON outputs - Collaboration (with real-time awareness and initial commenting system, available only when…

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  Skilldocs25d ago · skilldocs.dev · ▲192

  I got fed up with Notion, so I built my dream document editor. It's all markdowned so it's easy to view skills or other agent-related documents. It's got the collaboration features I love from Figma (shared cursory and the ability to follow) and Google Docs (comments, realtime editing). Then you can export the diff and comments to an agent. I've been really liking it for talking over skill documents live on a call. I'm curious if this resonates with other people. More generally, I feel like notion is less and less relevant in an age where documents have a very different purpose and Markdown…

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  OpenKnowledge – open source AI-first alternative to Obsidian/NotionJun 2026 · github.com · ▲381

  Hi HN, Nick here. We’re launching OpenKnowledge (https://openknowledge.ai/), a “what you see is what you get” markdown editor that has direct integrations with Claude, Codex, and other agents. Available as MacOS app or Web UI+CLI. Fully free/local and OSS. We built this because we wanted a Notion-like experience for writing and sharing markdown files across our team. Obsidian is the best alternative we tried, but found it doesn’t have a true WYSWIG UI and it didn’t integrate well with Claude/Codex outside of community plugins. So we built OpenKnowledge. It takes…

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  Notion-style editor for Tiptap Cloud2025 · ▲195

  Collaborative block-based editor → ready to drop in your app

• WW
  We want to displace Notion with collaborative Markdown filesMar 2026 · moment.dev · ▲29

  Hi HN! We at Moment[1] are working on Notion alternative which is (1) rich and collaborative, but (2) also just plain-old Markdown files, stored in git (ok, technically in jj), on local disk. We think the era of rigid SaaS UI is, basically, over: coding agents (`claude`, `amp`, `copilot`, `opencode`, etc.) are good enough now that they instantly build custom UI that fits your needs exactly. The very best agents in the world are coding agents, and we want to allow people to simply use them, e.g., to build little internal tools—but without compromising on collaboration. Moment aims to cover…

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• PU
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