Mavrig is the name of a website, where modules - called rigs - are collected for easy re-use. 

http://equi4.com/mavrig.org/
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On a post from jcw's weblog [http://jeelabs.org/2009/04/14/inside-jeemon/], I found a reference to Mavrig, then I wanted to try it with my PC running XP.<<br>>
For the record, this is what I did:<<br>>
1) download the tclkit for WXP from [http://equi4.com/tclkit/download.html], I understand you have to use version 8.5.x<<br>>
2) download mavrig from [https://github.com/jcw/mavrig]<<br>>
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