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XEngine uses and depends on the following excellent Open Source projects:
wxWidgets
STLport
Boost
Spirit
DevIL
lib3ds
FFTW

License

XEngine's license is based on the zlib/libpng license. Even though the license does not require you to mention that you are using XEngine in your product, a little acknowledgement somewhere would be highly appreciated.

The XEngine License

Copyright © 2002-2013 Martin Ecker

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.

You will find a copy of this license in all XEngine distributions in LICENSE.txt.