The Empirical Labs DocDerr has three circuits on board: a four-band eq, a compressor and a tape saturator. And all in a 500 series module. This is the vertical version.
The Empirical Labs DerrEsser is a top-quality de-esser and limiter for high frequencies. The filters used for this alone are worth the money. Horizontal version.
The Empirical Labs DerrEsser de-esser has a unique design that works independently of the input vineau. This transparently attenuates 'S' sounds in both hard and soft passages. Vertical version.