ThinkComposer Alternatives for Firefox

Joplin is a free and open-source note-taking and to-do application designed for users who value data ownership, privacy, and flexibility. It offers robust synchronization options, including cloud services like Dropbox, OneDrive, and Nextcloud, as well as WebDAV. With support for Markdown, powerful search capabilities, and cross-platform availability, Joplin is a versatile tool for organizing information and boosting productivity.

Mindomo is a versatile online mind mapping software that helps users organize thoughts, collaborate on projects, and deliver dynamic presentations. It offers a rich set of features for brainstorming, planning, and visualizing information.