Penpot: The open-source design tool for design and code collaboration

A privacy-first, open-source platform for knowledge management and collaboration. Download link: http://github.com/logseq/logseq/releases. roadmap: http://trello.com/b/8txSM12G/roadmap

Instant is a modern Firebase. We make you productive by giving your frontend a real-time database.

Athens is no longer maintainted. Athens was an open-source, collaborative knowledge graph, backed by YC W21

Create mockups with real-time collaboration