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Obsidian stores your notes as plain Markdown files in a folder you own, which means no lock-in, no subscription to read your own writing, and full-text search that works offline. Links between notes build a graph you can browse. The plugin ecosystem is large and covers most gaps. Personal use is free; syncing and publishing are paid.
Where it falls short
The plugin ecosystem is also the risk, since a heavy setup can become fragile, and there is no real-time collaboration.
Alternatives in Productivity
- NotionDocuments, databases, and wikis in one flexible workspace.
- LinearIssue tracking that is fast enough to use without thinking.
- TodoistTask management that stays out of the way.