Allegro is a game programming library for C/C++ developers distributed
freely, supporting the following platforms: DOS, Unix (Linux, FreeBSD,
Irix, Solaris, Darwin), Windows, QNX, BeOS and MacOS X. It provides many
functions for graphics, sounds, player input (keyboard, mouse and joystick)
and timers. It also provides fixed and floating point mathematical
functions, 3d functions, file management functions, compressed datafile
and a GUI.