Open-source bullet-point outliner. Plain markdown on disk (no UUIDs), peer-to-peer tree-CRDT sync that doesn't lose data when devices edit offline — your devices talk straight to each other, end-to-end encrypted, no cloud or third-party server holding your notes — and an MCP server so Claude, Cursor and ChatGPT use your notes as a second brain. A modern Roam, Logseq and Obsidian alternative built in Rust.
Scratch – A minimalist markdown scratchpad
An offline-first, open source markdown note-taking app. No cloud, no account, no subscriptions.
mdnb — A Markdown Notebook for macOS
A native macOS notebook app. Your notes are plain Markdown files on disk, yours forever. Free.
Peersky Browser (@peersky@mastodon.social)
Attached: 1 image 📝 v1.0.0-beta.20 — Introducing P2PMD A real-time peer-to-peer Markdown editor for notes and collaboration that syncs directly between peers, with no servers in the middle. Release: https://github.com/p2plabsxyz/peersky-browser/releases/tag/v1.0.0-beta.20 #PeerSky #p2pmd #markdown
HelixNotes | Local Markdown Notes
A local markdown note-taking app. Plain .md files on your disk. Sync them your way, or don't.
A Markdown Editor on AT Protocol — Diffdown
Diffdown — collaborative markdown editing on AT Protocol.
HackMD: Your Collaborative Markdown Workspace for Knowledge Sharing
HackMD gives you a real-time Markdown editor for collaborative work. Working with Markdown files in HackMD is simple, straightforward, and fun.
Scribe — Meeting notes that never leave your Mac
Scribe records, transcribes and summarises your meetings on your Mac. Free and open source.
socialde.pt/atproto.md
Markdown-first API for the AT Protocol ecosystem, built for LLM agents and tools that consume plain text.
FOSDEM 2026 - Teamtype: multiplayer mode for your text editor – towards a Collaborative Editing Protocol
Files on your hard drive are the ultimate local-first storage. But to allow real-time collaboration from within text editors, developers currently have to reinvent the wheel each time: Figure out how to hook into buffer changes correctly, implement displaying remote cursors, finding a way to get the required events in and out of the editor.
Marker
Marker is an open-source, user-friendly UI for writing & editing markdown files. Everything you create lives in your filesystem.
Treehouse: Note-taking Frontend
An open source note-taking frontend to extend and customize. Bring your own backend or configure a built-in backend to get started.
Fast Note Sync
Real-time sync of your vaults across server, mobile, and web; shareable with anyone; supports REST and MCP integrations to build your personal AI knowledge base.
Note taking apps
Notes, Outliners, Markdown Editors, PKMs, Memexs, Second Brains, Commonplace books, and more
OmniCanvas - Free Infinite Canvas Notes App
Best Notes App - Write and Organize with UpNote
Antinote — a $5 scratchpad for macOS
NotePlan – Notes, Tasks and Calendar in One Daily Note
Let your thoughts sink in — Gravity
Knowledgebase Apps (by Boris) — Semble