Logseq is a free and open-source, personal knowledge base and note-taking application which can store data locally. It supports both Markdown and org-mode syntax.
Tienson Qin started Logseq as a platform to store interconnected information on infinite graphs which would run on any device.
Logseq Inc was formed with An Vu, Huang Peng, Tienson Qin, and ZhiYuan Chen as founders, which raised over $4.1M for the growth. This seed funding round included investments from Stripe CEO Patrick Collison, Shopify CEO Tobias Lütke, and ex-GitHub CEO Nat Friedman.
Logseq is being used at Google Brain, IDEO, Meta, Tesla, MIT, Stanford and Harvard.