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Joplin is a free, open-source application for taking notes and organizing tasks that can handle a lot of notes organized into notebooks. The notes can be searched, copied, tagged, and altered either directly from the applications or using your own text editor. The notes are written in Markdown. Pictures, recordings, PDFs and sound documents are upheld. Diagrams and expressions in math can be created right from the app. Use the mobile app to take pictures and save them to a note. With Joplin cloud, you can collaborate on your notes with friends, family, or coworkers. You can also post a note online and give the URL to other people. Use plugins, custom themes, and multiple text editors (such as Rich Text or Markdown) to personalize the app. Or use the Extension API to develop your very own scripts and plugins.