Personally, I use mGSD (formally monkeyGTD) for many years. It's a great and handy tool to organize my life with Getting Things Done methodology.
As a programmer, I found a way to modify how it works soon, before the days I meet git and github to version control the code. Therefore, the mGSD file here is what I've cleaned up from the one I use daily, beforehand 2014-01-15.
No setup is need. Download the mGSD demo3.html and run it with Firefox. (tiddly-fox plugin is needed to save the change in Firefox.)
Edit "DefaultTiddlers" if you want to change the tiddlers shown when the file load.
Read "Plugins for mGSD" for the works I've done. mGSD official site: http://mgsd.tiddlyspot.com/#mGSD mGSD documentation: http://mgsd-docs.tiddlyspace.com/