Logseq

Local-first, open-source note-taking for people who think in graphs.

Best use cases
Personal knowledge management
Daily notes
Research organization
Second brain systems
Learning and note-taking
Pros
Local-first and privacy-friendly
Open source
Strong backlinking and graph view
Markdown and Org-mode support
Offline-first workflow
Cons
Mobile experience is still rough
Sync requires setup or paid service
UI can feel unfinished
Pricing
freemium
Free local use + optional paid sync service
Alternatives