Freeverb3 is a sound processing library which includes sampling rate scaling enabled version of freeverb with some fixes, extended implementation of N Reverb by CCRMA and implementation of impulse response convolution reverb. This library's oversampling feature provides higher quality of audio processing.
Freeverb3_vst is a VST plugin version of the freeverb3 library.
This is a reverb device that works with impulse-responses. Impulse-responses are generated by recording short broadband signals and their corresponding room-reflections. What you get contains the information needed to reproduce the same room with other signals.
Atom Splitter Audio has released MechaVerb, a freeware reverb effect plug-in for Windows PC.
Mechaverb is a reverb effect where you can set the ranges of the internal delays which make up the reverb sound, you can also pan the bands and set there mixing amount which gives you a range of possible sounds from large halls to ringy metallic reverbs.