The following must be thanked for ZEngine:

Sam Lantinga and the SDL Crew - Creating and Maintaining such a great library and helping on the mailing list.
    http://libsdl.org
Dimitri van Heesch and Everyone Associated with Doxygen - Providing such a great Documentation Tool.
    http://doxygen.org
Everybody Associated with ConceptOfZero.net - Keeping Me Working on ZEngine.
    http://conceptofzero.net
The people at the Kahvi Collective - Providing tons of free Ogg music.
    http://www.kahvi.org
Sourceforge.net - Providing hosting for the project and CVS.
    http://sourceforge.net
Some people at GameDev.net for helping out in OpenGL.
    http://gamedev.net
gametutorials.com and nehe.gamedev.net for Linking to ZEngine and OpenGL support.
    http://gametutorials.com & http://nehe.gamedev.net
People at Bloodshed and in charge of MingW for together providing a great free compiler and IDE based on GCC.
    http://bloodshed.net & http://mingw.org

Also see the test/bin/readme.txt file for credits on the data used in the demos.