PSPaudioware released PSP HertzRider, a frequency shifter plug-in. It can be an incredible tool for tuning inharmonic sounds like snares, and for harmonic sounds it becomes a creative and crazy destructive tool. In addition to a wide range of shifting settings the algorithm contains an LFO (low frequency oscillator) to provide interesting modulation options allowing you to further creatively experiment with this tool.
PSP HertzRider is designed to be as simple as possible, to take as few resources as possible, and to incur only a very slight (and frequency dependent) latency.
More info here: PSPaudioware | PSP HertzRider