SPCLoopFinder is a utility to find loop points in audio samples at offsets divisible by 16 for use with the SPC700 (the SNES’s sound chip.) It can also find loop points at other locations for use when working with samples in general.
You can download version 1.0 here. Source code is included but it hasn’t been tested on OSes other than Windows. You’ll probably need GtkSharp to compile or run it. Some features are not implemented at the moment, but nothing critical.