Bitbucket shaved off too many features from their public profile interface in early 2016, so I much more prefer to show my own list of projects here (using their API). Only some of the latest pet projects are featured here, see the section below for the full list.
Since my preferred VCS is Mercurial, I put my code here.
Also, a big chunk of ExtJS experience comes from this project.
Projects hosted here also get my attention, but not that often.
It's similar to Project Euler, but most of the problems are more bioinformatics-related than maths-related.
Software needs packaging, and PKGBUILDs are Arch's way of doing it. They are somewhat similar to Gentoo's ebuilds in that they allow the freshest versions of software (even from VCS). There used to be more things that I've uploaded and have been maintaining, but some stuff moved to [community] and some was deleted in that big AUR upgrade.
Improving localization is essentially improving user interface. When I was just starting as a translator, I used Rosetta, which is Launchpad's translation service. And it still tracks my translations, diligently, even though I don't use the system.