Trilium

Joplin

Joplin is a free, open source note-taking and to-do application that can handle a large number of notes organized into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor. The notes are in Markdown format. Joplin is also available for mobile devices as a progressive web app.

logseq

Logseq is a knowledge management tool that helps users organize their thoughts, notes, and ideas in a structured and connected way. It allows users to create a personal knowledge base that is easily searchable and navigable. Logseq is designed to be a flexible and customizable tool that can be used for a wide range of applications, from note-taking and research to project management and personal development.

Obsidian

Obsidian is a note-taking and personal knowledge management app built around plain markdown files stored locally on your device. Rather than a rigid folder hierarchy, Obsidian encourages a networked structure through bidirectional links, backlinks, and an interactive graph view that visualizes how notes connect. Because notes are just markdown files on disk, Obsidian is fast, works fully offline, and keeps your data portable - there is no proprietary lock-in. A large community plugin ecosystem extends the core app with everything from spaced-repetition flashcards to kanban boards and calendar views. Obsidian Sync and Obsidian Publish are optional paid add-ons for cross-device syncing and publishing notes as a website, but the core app is free for personal use.

Foam

Foam is a free, open-source note-taking application that uses a graph database to store notes as a network of interconnected ideas. It's designed to help users create a knowledge graph, where each note is a node that can be linked to other notes, creating a web of relationships between ideas.

AFFiNE

AFFiNE is a versatile and customizable workspace that combines the features of note-taking apps, knowledge management tools, and project management software. It allows users to create a personalized workspace that adapts to their unique needs and workflows.