The Embedded File System (EFS) library, of which the first stable version, 1.0, has just been released, is a C++ library that creates a virtual filesystem in a file.
The Seamstress image manipulation library promises smaller images without compromising detail. Version 1.0.0 of the software, which was released recently, uses an "energy function" to analyze various areas of the image before compressing and does not change eye-catching areas.
If you'll pardon the pun, the Libquantum C library has now leaped from version 0.2.4 to 0.9.1 after three years of seeming inactivity. The new version includes a new API which gives users the ability to simulate quantum mechanics.
Boo is a scripting language tailor-made for Mono and .NET. This haunting mixture of Python and C# may be just what you need to get started with the .NET framework.
If you follow the fortunes of large installation IT, tune in on November 12-14 for a front row ticket to the Invited Talks series of the USENIX LISA conference.