TiddlyWiki is a micro-content wiki suitable to be used as a personal notepad.

Not in the Top 100 in 2013

Website Cost Availability
www.tiddlywiki.com Free – Open Source Download
2013 2012 2011 2010 2009 2008 2007
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Comments from some of those who selected TiddlyWiki as one of their Top Tools 

“OpenSource TiddlyWiki is a complete wiki in a single HTML file. It contains the entire text of the wiki, and all the JavaScript, CSS and HTML goodness to be able to display it, and let you edit it or search it. Without needing a server.” Andreas Büsing
“Small, one-person wiki I use to track clients, projects, and ideas. I have a sample Tiddlywiki here” Cathy Moore