AllMyNotes

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. KeepNote is designed to be cross-platform (implemented in Python and PyGTK) and stores your notes in simple and easy to manipulate file formats (HTML and XML). Archiving and transferring your notes is as easy as zipping or copying a folder. In KeepNote, you can customize the icons that appear next to your notes. To change a note's icon, right-click on the note and locate the Change Icon menu. You will then see a list of icons to choose from (see left screenshot below). You can use this feature to mark notes that are your favorite (heart), important (start, exclamation mark) or done (check mark).

TagSpaces is privacy aware, cross-platform file browser with note-taking capabilities. It helps you organize your files and folders with tags and colors. Free downloads are available for Windows, macOS, Linux, and Android. With the built-in advanced markdown editor, you can create notes that can include tables, todo-lists, math formulas, or diagrams. TagSpaces can connect to any folder on your hard drive and provide a convenient way to browse its content. You have the ability to add labels called tags to any file or folder. Using tags along the folder hierarchy allows you to have cross-references in the folders. The built-in search allows you to find files with any combination of tags. On top of that in the Pro version, you can add descriptions and geo-tags to files and folders. The Pro version gives you the ability to turn every folder to a Kanban board, which can be useful in many ways. With the TagSpaces Web Clipper, you can collect web pages and bookmarks from the Web.