http://h34nug3iwqjf2376fmmzdhgqivckzemcujmarlptfqeqtq7vya47yyad.onion/2007/02/page/2/index.html
It’s a WYSIWYG (What You See Is What You Get) text editor and works like a wiki, so you can have links between your pages, and pages are stored in a hierarchical structure, which makes them easy and to browse. Zim is the perfect application to take notes and keep TODO lists somewhere in an organized fashion.