SmartWin++ is a C++ template GUI library written to give the flexibility of the Windows API without the hassle and lack of typesafety that MFC/WTL delivers. A flexible, expandable abstraction of the Windows API (formerly Win32 API).
The Winfessor .NET Unit Test Library is a very simple, feature-lacking unit test framework and Winforms GUI designed to get the job done. Tests are ran on a background thread so the GUI remains responsive. Attributes are used to designate test items.