mwcollectd v4, a next-generation low-interaction malware collection honeypot, has just been released. It's written in C++, but the easy integration of additional Python modules means that malware researchers around the world can easily extend the honeypot with new protocols and features.
We're happy to be sponsoring this project, which was mainly developed by Georg Wicherski (one of our virus analysts in Germany) and Mark Schloesser, from RWTH Aachen University. It's published under the LGPL license. If you want to take a look at mwcollectd, it's here, and libemu, which is used by mwcollectd, is here.