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An incomplete list of reverbs

The winner

Runner up
Freeware VST algorithmic reverbs
For-pay VST algorithmic reverbs
The following generate impulse responses
Freeware convolution reverbs
Other convolution reverbs
Nebula deserves its own category. It’s similar to convolution, but uses different math which appears to make the samples more flexible than a standard convolution reverb. This is a list with Nebula, along with some third party reverbs rendered with Nebula.
Other lists of reverbs
Hardware reverbs

Some hardware reverbs:

See also