In this video, Joshua Casper goes over Polaris by Audiority and demos a few of its presets on a drum loop.

Polaris is an echo/reverb plugin inspired by early hardware digital reverbs of the late 1970s and able to provide echo, ambience and reverb out of a single multitap delay line.

When hardware digital reverbs came out to the market they were really expensive. Most manufacturers were already exploiting chains of comb and allpass filters (smoother reverbs, but expensive in both resources and chips), there were other techniques involving the use of a single multitap delay line to create a reasonable reverb while keeping the cost affordable.

That idea is so simple yet powerful: you mix a bunch of unmodulated taps (Early Reflections) with the remaining modulated taps (Diffusion) to create a cheap but convincing reverb.

Try/Buy/Check-Out Polaris at