Windows Template Library
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The Windows Template Library (WTL) is a Win32 encapsulation library by Microsoft. The WTL supports an API for use by programmers. It was developed as a light-weight alternative to Microsoft Foundation Classes. It makes heavy use of Microsoft's ATL, another lightweight API for using COM and for creating ActiveX controls.
In an uncharacteristic move by Microsoft, an outspoken critic of open source software, they have made the source code of WTL freely available. Microsoft's version of WTL is 3.1. An open source implementation, hosted by SourceForge, has reached version 7.0.