Best Open-source Note-taking Apps

Notesnook is a secure, offline-compatible note-taking app designed to keep your information private with end-to-end encryption. Users can create and organize notes, to-do lists, and ideas across devices while maintaining a distraction-free workspace. The app also supports rich formatting options, making it versatile for various content types.

1. Journaling: Private and secure place for personal reflections
2. Organized note storage: Create and structure notes to keep track of related ideas and tasks
3. Research notes: Securely store sensitive data and research insights

Joplin is an open-source, cross-platform note-taking and to-do application that focuses on security, flexibility, and syncing. It allows users to create, organize, and search their notes using a familiar markdown-based interface. Joplin stores all data locally in encrypted files, giving users full control over their information.

1. Personal knowledge management: Build a secure, searchable repository of notes, ideas, and information
2. Task and project planning: Organize tasks, to-do lists, and reminders in a centralized location
3. Secure note-taking: Create sensitive notes and documents with end-to-end encryption

Logseq is an open-source, local-first knowledge management tool that combines note-taking, task management, and graph visualization. It allows users to create and link notes using a freeform, markdown-based approach, forming a personal digital garden of interconnected information.

1. Personal knowledge management: Build a searchable repository of personal notes, ideas, and insights
2. Research and study: Organize research materials, literature notes, and academic references
3. Project planning and task tracking: Manage tasks, projects, and workflows in a freeform environment

Deepnotes is a web-based collaborative workspace designed to create non-linear, interconnected notes and visual knowledge graphs. Its innovative approach allows users to build dynamic, spatial networks of information with intuitive linking and visualization capabilities.

1. Team Knowledge Management: Collaborative information mapping
2. Research and Documentation: Non-linear idea exploration
3. Project Planning: Complex interconnected brainstorming