- rakarrack - Effect rack for guitar
- raul - C++ utility library primarily aimed at audio/musical applications.
- raul-devel - Header files for raul
- resample - Sampling-rate conversion program
- rezound - ReZound is a sound file editor and recorder
- rubberband - Audio time-stretching and pitch-shifting library
- rubberband-devel - Development files for rubberband
- rubyecasound - Ruby bindings to ecasound control interface.