Wikipedia
YAAF
YAAF stands for Yet Another Application Framework, a C++ framework or library which is designed to facilitate creating cross-platform applications which can be compiled and run under Microsoft Windows, Mac OS 9 and Mac OS X under Carbon, and X Window on Linux.
YAAF is distributed under the YAAF Open Source License which is BSD-like. Development of YAAF stopped in August of 2004.
As of August 1, 2012, the YAAF website cannot provide any source code for the library, as the links for the code are to a directory on homepage.mac.com, which was discontinued on that date. Also, no documentation is available as it was stored on either the discontinued homepage.mac.com or on a discontinued cafeshops.com site.