WonderPen is a writing app for both professional and amateur writers. Features: Tree view, drag-and-drop to reorder. An easy-to-use text editor that supports Markdown. Supports full-screen mode, lets you focus on writing. Docs can be exported as Image, PDF, Word, HTML, etc. Auto save while editing. You can backup all docs as a single file and restore from it later. Add memo for each doc. Focus on one node of the doc tree. Search in all docs. Automatic backup.