Silverspike Reverb-It. Not bad. Some presets.
Oxford Reverb. Low quality with few presets.
Izotope Ozone 3. Multi-effects unit.
Hematohn for weird, space age effects.
Fruity Reverb 2 is the best!
Fabfilter Timeless is more of a multi-effect unit.
Ambiance for Reverb. Lots of Presets here.