ProTracker is a popular freeware tracker created by Lars Hamre, Anders Hamre, Sven Vahsen and Rune Johnsrud for the Amiga platform. It is amongst the programs that first allowed for widespread creation of music without studio equipment. It was popular for amateurs and professionals alike, and ProTracker amongst others set a standard for the MOD fileformat.There's an ongoing effort to make a clone of ProTracker for modern platforms at SourceForge.