The world’s largest software company seems to be coming onboard the open source movement slowly. While they still need to get over their fear of the GPL before their software is really free-as-in-freedom, there is some encouraging news. The Windows Installer XML toolset (WIX) and Windows Template Library (WTL) have been released under the CPL (CPL full text here) and are hosted at Sourceforge. WIX: http://sourceforge.net/projects/wix
WIX is used to manage Windows Installer MSI and MSM modules for packaging and deployment.
WTL is a set of C++ templates for Windows programming that uses ATL (no MFC) for fast, stable, Win32 applications. It was developed and used internally and Microsoft decided to free it’s development to the community.