obsidian.md
Markdown note-taking with linked notes, like a second brain.
Strengths
- Free, even for work, with no feature limits
- Notes stored locally in Markdown: you own your data
- Links, graph view and thousands of community plugins
Limitations
- Syncing between devices is paid (from $4/month) or DIY
- Learning curve to get the most out of it
- Limited real-time collaboration
