Schism Tracker is a music editor that aims to match the look and feel of Impulse Tracker as closely as possible. This SourceForge project page is more or less abandoned -- current development is ongoing at schismtracker.org.
Its a very cool program and I hope its still developed in the future. I have problems with newer versions with the CTRL+P command, with multi key playing on the instrument page F4, some little stereo issues with 1 or 2 old songs of mine and I miss filter technics to smooth samples in the beginning/ending. Its overall a great project I dont wanna miss. I still do music with it(IT) lol.
This program is highly recommendable. I've used Impulse Tracker since 1998 or so and Schism Tracker is more than a worthy successor. It does the trick for those who just want Impulse Tracker functionality, but also extends on some of the features Impulse Tracker didn't have (like allowing for more than 99 samples). Highly recommendable.