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.