Outliner Websites
keepnote.org
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...
1,291,109 
$ 960.00
checkvist.com
With Checkvist you can create and share online outlines, project plans, online checklists, and task lists. Very keyboard friendly, with code, Markdown, and OPML support.
253,118 $ 32,400.00