The most popular alternative is Joplin, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to TheBrain so hopefully you can find a suitable replacement. Other interesting TheBrain alternatives are Pocket (Freemium), Zotero (Freemium, Open Source), Obsidian (Free Personal) and yEd Graph Editor (Free).
- An open source note taking and to-do application with synchronisation capabilities.
- Save webpages to read later, and eliminate cluttering of bookmarks with sites that are merely of a one-time interest.
- Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
- Powerful knowledge base that works on top of a local folder of plain text Markdown files.
- yEd is a powerful diagram editor that can be used to quickly create diagrams manually or import external data for analysis and auto-magically arrange even large data sets by just...
- Whether it's bookmarks or passwords, files or shopping lists...Turtl organizes it all and makes it easy to find later. Sync across your devices. Leave nothing behind.
- Free and open source, Java-based mind-mapping app for the desktop featuring a hierarchical editor that emphasizes folding.
- XMind is a brainstorming and mind mapping application. It provides a rich set of different visualization styles, and allows sharing of created mind maps via their website.
- Extensible, multi-platform mind mapping creation, analysis and presentation software.
- Open-source, Java-based UML diagram maker using plain text descriptions to draw models.