Logseq

Logseq is an open-source, privacy-focused knowledge management tool built on a block-based outliner. It emphasizes connecting thoughts through linked references and queries, functioning as a networked note-taking platform. Its daily journal page serves as a central entry point. Features include integrated task management with queries, whiteboard canvas, and PDF annotation.

Data is stored locally as Markdown or EDN files. Completely free for local use, with optional paid hosting. It's perfect for users who think in outlines and want a highly structured, interconnected, and transparent system for managing projects and research.