Jason Coates - Graphical assets

Cocos2dx - www.cocos2d-x.org/

Clipper Lib - http://www.angusj.com/delphi/clipper.php

JsonCpp - https://github.com/open-source-parsers/jsoncpp

FMOD Studio, copyright Firelight Technologies Pty, Ltd., 2012-2016.

crashrpt - http://crashrpt.sourceforge.net/

Ian McEwan, Ashima Arts - Array and textureless GLSL 2D simplex noise function 

Stefan Gustavson (Classic noise and others)

Boost C++ Libraries - http://www.boost.org/