KeepNote: Note taking and organization KeepNote, note-taking, organization, outliner, OneNote, OneNote Alternative, free OneNote, notebook, journal, lab book, research, GTD, To-do list, mind mapping, backup, screenshot, wiki, Linux, Windows, Mac OS X, Debian, Ubuntu KeepNote: note-taking and organization. KeepNote is a note taking application that works on Windows, Linux, and MacOS X. With KeepNote, you can store your class notes, TODO lists, research notes, journal entries, paper outlines, etc in a simple notebook hierarchy with rich-text formatting, images, and more. Using full-text search, you can retrieve any note for later reference.