Logseq
Logseq Inc.
Logseq is an open-source outliner that supports native plain-text Markdown and Org-mode files. It has features such as backlinks, knowledge graphs, page and block references/embeds, tasks and to-do lists, SRS cards, Zotero and multimedia integration, recording, and powerful query capabilities. It is suitable for writing, organizing ideas, maintaining to-do lists, and building a personal digital garden.