fm is a simple fm instrument osplay is a simple additive synthesis instrument r2w1 mixes two input files to one output file reverbit takes a stereo input file, adds some reverb, and delays and phase inverts part of it in one speaker to add a gentle reverb effect in stereo using only one reverb unit.
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.