#collaboration

Open Source

tldraw: The 47k-Star Whiteboard You Can Fork but Cannot Ship Freely — A License Story Disguised as a Review

tldraw is a 47.5k-star infinite-canvas SDK — but since v4.0 (September 2025) it is source-available, not open source. This deep dive covers the license change, the production license key, the watermark, how tldraw sync actually works, what self-hosting still gives you, and why it belongs in the same conversation as Cal.com and Excalidraw.

2026-10-01 74 views

Open Source

HedgeDoc: The Collaborative Markdown Editor That Owns Your Meeting Notes — and the AGPL Fine Print You Should Read

HedgeDoc is a 7.4k-star, AGPL-3.0 real-time collaborative Markdown editor descended from HackMD's open-source edition. This deep dive covers its CodiMD lineage, the operational-transform engine, what HedgeDoc 2's stalled rewrite means for you, the real cost of running it, and where your notes actually go.

2026-10-01 68 views

Open Source

"Docmost: The Notion Alternative That Makes You Pay for SSO — and Why That Is the Right Question to Ask"

"Docmost is a 21k-star, AGPL-3.0 collaborative wiki and Notion alternative. This deep dive covers the open-core line it draws, what v0.96.0 actually shipped, and the one honest caveat every self-hosted knowledge base forces you to confront."

2026-09-29 66 views

Open Source

Zulip: The Open-Source Team Chat With No Open-Core Catch — and a 10-User Push Notification Limit

Most 'open-source Slack alternatives' put SAML, LDAP, and guest access behind a paywall. Zulip is Apache-2.0 with all of it free — but self-hosted mobile push notifications stop at ten users unless you build your own app.

2026-09-13 80 views

# collaboration

tldraw: The 47k-Star Whiteboard You Can Fork but Cannot Ship Freely — A License Story Disguised as a Review

HedgeDoc: The Collaborative Markdown Editor That Owns Your Meeting Notes — and the AGPL Fine Print You Should Read

"Docmost: The Notion Alternative That Makes You Pay for SSO — and Why That Is the Right Question to Ask"

Zulip: The Open-Source Team Chat With No Open-Core Catch — and a 10-User Push Notification Limit