moip_aira is an implementation of a parallel multi-objective integer programming algorithm that aims for perfect parallelisation. This project is under active development, but as yet has no official releases and as such may be broken at various releases.
graphlib is a library of graph decomposition techniques that were used to find various decompositions and factorisations which were in turn used to solve the cycle decomposition problem for complete graphs.
rook_decomp is a small program that is currently trying to find a decomposition of the complete bipartite graph on 2n vertices into copies of the rook graph Kn.
My Github page lists many other projects that I have at some point worked on.
I am one of the developers of Regina, a suite of mathematical software for 3-manifold topologists. It focuses on the study of 3-manifold triangulations and normal surfaces. I also maintain the Gentoo packages for Regina. For official downloads for other distributions, see http://regina.sourceforge.net.
Gentoo packages for Regina are available in a layman overlay.
Once layman has been installed, you can install the overlay by running
# layman -a regina-gentoo.
You will then be able to install Regina with
# emerge regina. Note
that version 9999 of Regina in the overlay will always update to the latest GIT
revision, which may or may not work at any given time.