Interesting, but 1.3 million pages is somewhat limited. They seem to have done a good job indexing Wikipedia. I'm curious, why not scan the full ipv4 address space and index the main page of every website you find?
http://axcas.net is an online computer algebra system I've been working on. I'm working to finish the programming language which is based on C, and I'm adding an ode solver which I plan to use to evaluate special functions.
I release code into the public domain hoping it will be useful. There's some fast code for Groebner basis computations using the F4 algorithm (parallelized - article to follow), and some routines for machine integers e.g. discrete logarithm, factoring, and prime counting.
Build side projects if you have the time. For example, I have a computer algebra system hosted online. Every week I add a couple of algorithms just by working on it when everyone else has gone to bed. Sometimes I get a lot done, sometimes not a lot, it varies. But it has definitely stopped atrophy.