Links

Plugin Suites

Families of plugins by the same authors

Available for Windows

MFreeFXBundle

A collection of 37 effects in categories like Analysis, Saturation & distortion, Dynamics, Equalization, Mastering, Mixing, Pitch and others.
MFreeFXBundle
Download page

Available for macOS

MacOS already ships with a range of Audio Unit effects which you can try out

MFreeFXBundle

A collection of 37 effects in categories like Analysis, Saturation & distortion, Dynamics, Equalization, Mastering, Mixing, Pitch and others.
MFreeFXBundle
Download page

Available for Linux

swh Plugins

A set of LADSPA effects. They can be found in most Linux repositories.

Calf Studio Gear

An LV2 plugin suite featuring a wide array of plugins for audio mixing and mastering. As of version 0.90.0 there are 47 plugins in the suite.
Note: The virtual instruments included are not supported in Audacity.
The Calf plugins can be found in the repositories of most Linux distributions, additionally, compilation instructions can be found here:

Available for all platforms

GVST

A set of simple VST effects, most known for the GSnap (auto-tune) effect.
GVST - Packages
Download page

IEM Plugin Suite

A set of open source plugins by the Institute of Electronic Music and Acoustics of the University of Music and Performing Arts Graz. Strong focus on ambisonic functions; see their plugin descriptions.