A couple of hours ago I found myself, together with a couple of friends, locked in a small vault in a basement of an old tenement house in Wrocław/Poland. Objective: escape the room in 60 minutes (+ complete a side quest). To do this we had to look for clues, solve riddles, break codes (not unlike some crypto challenges I've seen on CTFs, though much simpler) and do quite a lot of creative thinking. In the end we failed (we were so close it's painful!). But we had A LOT of fun on the way anyway :). This kind of game is called "Live Escape Room" and the one we went to, which I strongly recommend, was the room "Vault" by Piwnica Quest.
Adobe Reader 9.5.1 and 10.1.3 multiple vulnerabilities - 62 unique crashes, from that 31 trivially exploitable and 9 more potentially exploitable, 11 CVE's assigned (CVE-2012-4149 to CVE-2012-4160). Some of these bugs were fixed for Windows and OSX releases of Adobe Reader in APSB12-16.
Contributed to discovery of multiple low-to-high vulnerabilities in Google Chrome (CVE-2012-2851, CVE-2012-2855, CVE-2012-2856, CVE-2012-2862, CVE-2012-2863 and some other) - some of these were mentioned in this post.
A lot of bugs in ffmpeg and libav which resulted in 892 (sic!) patches in ffmpeg and 299 patches in libav (CVE-2011-3930 to CVE-2011-3952 and some other).
Mozilla Firefox 188.8.131.52 and Opera 9.50 information leak, also midly affected Safair, Konqueror and some other products (CVE-2007-6524, CVE-2008-0420, CVE-2008-0894, CVE-2008-1573). A demo video is also available.
PiXieServ is a simplified PXE (network boot) server for Windows and Linux-based OS, created for testing of very small home-made OS. See also the post about it.
ExcpHook, a system-wide exception monitor for Windows XP 32-bit. Useful if you're fuzzing something that doesn't like having a debugger attached.
Ent is an entropy measuring tool for reverse engineering reconnaissance (see also a post explaining how to use it).
HiperDrop is a simple command line process memory dumper for Windows, with a few different work modes.
asmloader - this little app executes headerless machine code (compiled assembly code). It's meant to be an aid in learning/teaching and playing with assembly, as well as the right tool when you just need to execute some machine code.
NetSock is a simple socket/networking lib/wrapper for C++ I've wrote back in 2003 and update from time to time - I use it for most of my network-enabled projects.