RoomReverb

PROS:

• Incredibly direct, non skeuomorphic interface.
• Low system requirements.
• Output sound is useable, not mind-blowing but perfectly acceptable-sounding.

CONS:

• Just not as good-sounding as other freeware reverb plugins. When you could use the likes of EpicVerb or Ambience, it's kind of like "Why use anything else?" It's a shame though because this probably has my favorite UI of any reverb plugin I've used. I wish Ambience looked more like this.