Waverazor is a synthesizer. As it says in the review, you put in MIDI notes, and Waverazor plays a sound.
It is software synth (as opposed to a piece of standalone hardware like in the old days), available as a 32-bit and/or 64-bit plugin for Windows and Mac systems.
Check out this video:
It offers a unique continuous modulation of various parameters in each waveform slice that can be very useful for evolving sounds. A lot of the sounds that can be made with Waverazor will remind you of 70’s to 90’s manipulated sounds.
It offers old and a few new options, but is it worth buying?
Read about the verdict here: http://bedroomproducersblog.com/2017/06/11/waverazor-review/