Foam is free, open source, and extremely extensible to suit your personal workflow. You own the information you create with Foam, and you’re free to share it, and collaborate on it with anyone you want.

The hierarchical note taking tool that grows as you do. Dendron is an open-source, local-first, markdown-based, note-taking tool built on top of VSCode. It lets you easily create, find, and manage knowledge bases of any size.

Athens is an open-source and local-first alternative to Roam Research. Athens is the most powerful and transparent knowledge graph.

Logseq is a joyful, open-source outliner that works on top of local plain-text Markdown and Org-mode files. Use it to write, organize and share your thoughts, keep your to-do list, and build your own digital garden.