Freeverb3 is described as 'Sound processing library which includes sampling rate scaling enabled version of freeverb with some fixes, extended implementation of NReverb by CCRMA, implementation of impulse response convolution reverb, FIR filter constructor, band splitter, softknee/hardknee' and is an app. There are more than 10 alternatives to Freeverb3 for Windows, iPhone, iPad and Mac. The best Freeverb3 alternative is Avid Space. It's not free, so if you're looking for a free alternative, you could try MConvolution or Rooms!. Other great apps like Freeverb3 are Voxengo Pristine Space, Christian Knufinke SIR2, Waves IR-1 and Mobile Convolution Reverb.