Allegro is a portable library mainly aimed at video game and multimedia 
programming, originally started by Shawn Hargreaves for the DJGPP compiler 
in a mixture of C and assembler.

According to the Oxford Companion to Music, Allegro is the Italian for 
"quick, lively, bright". It is also a recursive acronym which stands for 
"Allegro Low LEvel Game ROutines".

Cross-platform support

    o Dos (DJGPP, Watcom)
    o Unix (Linux, *BSD, Irix, Solaris, Darwin)
    o Windows (MSVC, MinGW, Cygwin, Borland)
    o BeOS
    o QNX
    o MacOS X