PyScape generates dynamic soundscapes using the OpenAL library which can be manipulated interactively via a GUI. Several CC-licensed sounds are included, such as the Buddha Machine loops and various nature sounds.
soundeffects can do the following sound effects on all file formats supported by libsndfile (wav, ogg, etc.): echo, change pitch, compressor, rotate, stereo boost, set surround position, and split a surround stream in its individual channels.