AriesVerb is a multi-effects processor in VST format with extremely low CPU usage. Examples of what it is capable of include but are not limited to:
Reverbs
Delays, Echoes and Reflections
Choruses and Flangers
Stereo Transformations
Body Resonances, Filters
Distortion
Dynamics
Pitch shifting
FM effects
... plus arbitrary blends and crossovers of any of the above