Obsidian is a local-first Markdown note-taking app developed by a Canadian team. The core app is free and it is known for bidirectional links and the knowledge graph. With 1000+ community plugins and paid Sync/Publish add-ons, it is a popular choice for personal knowledge management and a second brain.
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Tana is a new-generation structured AI note-taking and knowledge management tool from San Francisco, launched in beta in 2023, built around Supertags and Tana AI. It offers a free plan with subscriptions around $10-15/month for structured personal knowledge bases.
Foam is a free, open-source personal knowledge management tool built on VS Code, using local Markdown files and bidirectional links to build a knowledge graph, completely free under the MIT license, suited to technical users familiar with VS Code and Git.