ZweiDe is a game development framework specialized on two-dimensional games. It is based on the .Net environment, OpenGL and irrKlang providing an easy-to-use class complex for graphics, sound, user input, etc. While engine and source code are completely free for any use, the irrKlang library that is used for its sound support may be not. You should check its license separately regarding your own projects aims (commercial / free).
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