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

Website www.tiddlywiki.come Top 100 Tools for Personal & Professional Learning 2017  –
Cost Free. Open source Top 100 Tools for Workplace Learning 2017  –
Availability Download Top 100 Tools for Education 2017  –
Past Overall Rankings
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Comments from some of those who selected TiddlyWiki as one of their Top 10 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