Virtual Studio Technology (VST) is an interface for integrating software audio synthesizer and effect plugins with audio editors and hard-disk recording systems. VST and similar technologies use Digital Signal Processing to simulate traditional recording studio hardware with software. Thousands of plugins exist, both commercial and freeware, and VST is supported by a large number of audio applications. The technology can be licensed from its creator, Steinberg.

Source: Wikipedia


You can use VST plugins if your media player support it.


MusicBee: VST Effects Support


Foobar: Foobar2000 VST 2.4 adapter


Some examples.