Notenik is a simple yet powerful and flexible system for taking, collecting, organizing and publishing Notes. Each Note is stored in its own plain text file. A folder full of Notes becomes a Collection. Create as many Collections as you like, and store them wherever you like. Store them in iCloud Drive, or in your Dropbox folder, and let them sync to your other devices. Each Note consists of one or more fields: minimally, a Title and a Body, but you can add more, based on your needs for a particular Collection. Use Markdown to format the Body of your Notes (including footnotes, citations, definition lists and Math equations!). Add Tags to your Notes to see them organized by topic or some other system. Each Note can have multiple tags, and each tag can have multiple levels. Tags are stored within the text files, so they will sync along with your Notes to other devices. Add a Link field to your Notes and use them as Bookmarks, or simply to reference additional information for a Note. You can also add Date and Status and Recurs fields to your Notes, and then use them as a To Do system. Add Seq + Level fields to use your Collection as an outline. Import and export and share your Notes using a variety of different formats. Notenik is open-source software and free.