TouchWM is a touch-friendly SDK/Framework for developers, meant to be as fast as possible since it is hardware accelerated by OpenGL (based on OpenGLES wrapper made by Koush).
TouchWM is currently just a proof of concept and CPU/GPU benchmark
Windows Mobile 6.5 Widget Packager makes it easier for Windows Mobile 6.5 Widget developer to generate widget config file and package the widget files into .wgt file. You will no longer have to do these jobs manually. It's developed in C#
Winsock API Wrapper - Access Winsock API from Visual Basic (with added support for Unicode strings) If you have had experience with using the Winsock control in Embedded Visual Basic, you might have come across it's limitation of not being able to send binary data. dgSocket.dll improves on several aspects of the winsock control
WMGL - WMGL is the Graphic Library developed for Windows Mobile devices. It provides easy-in-use interfaces for fast alpha blending and various 3D effects. You can use it from your C++ or C# (.NET CF) project.
The library is currently used in the Touch Shell project