I decided to put some order into open-source code I published, and created the page which lists those modules:
This page is expected to grow, both with new items, and (not yet published) old code I am going to polish and publish.
Most notable recent additions:
a bunch of Mercurial extensions. (they are all relatively simple, but make my daily life with Mercurial noticeably prettier),
set of Perl modules (mostly support for saving sensitive data like passwords or keys in secure password databases),
group of scripts which make using CVS slightly less painful.