libplayit is an IT playback-only fork of the Schism tracker[1] player
engine for demo use.

Schism tracker originally was built on libmodplug for playback.  Over time
playback quality and correctness issues were fixed without percolating
upstream.  Additionally, eventually all of the modplug C++ source was
converted to plain C code.

See the code in examples/* for how one might use this library to play .it
files.

[1]: https://github.com/schismtracker/schismtracker