EngineersFilter – VST Filter Plugin EngineersFilter is a filter plugin that allows for extremely steep filtering. It achieves this by implementing high order IIR filter design methods that are commonly used in science and engineering, namely Butterworth, Chebychev, inverse Chebychev, elliptic (aka Cauer), Bessel and Papoulis filters.
CrossOver – Split Incoming Signal Plugin CrossOver is a free VST plugin to split an incoming signal into several (at most 4) frequency ranges. It can be used to build your own multiband effects within a modular (sub)host environment. By using only 2 bands, you can also create bass-effects.
EasyQ – Free EQ / Equalizer VST EasyQ is an free easy-to-use vst equalizer with an arbitrary number of filter stages in series connection. Each of the filter stages can operate in one of the following modes: peak/cut (aka bell or parametric EQ), high- or low-shelving, notch and low- or highpass (both with either 6 or 12 dB/oct slope).