FREE vocal plugin

Vocal recording and effects chains include, depending on the performance, a de-esser, a noise gate, an equalizer, and a compressor. Frequently, engineers also add effects like chorus, delay, tape saturation (unless recording to tape, of course,) and reverb, to enhance the sound.
In a pro studio, most of this treatment is handled by expensive hardware and plugins (like those from Waves and UAD.) But you don’t have to break the bank to polish up your vocal tracks thanks to the many libraries of free plugins found on the Internet, most available for any DAW that supports the VST standard.
I’ve compiled a list of the best plugins for a killer free vocal chain, along with a sample of the plugins at work on one of my vocal tracks.

The Plugins

De-esser: Spitfish [Windows and Mac]
Noise gate: Floorfish [Windows and Mac]
EQ: Nyquist EQ [Windows and Mac]
Also consider Kjaerhus Classic EQ [Windows only] and Paris EQ [Windows only]
Compressor: Kjaerhus Classic Compressor [Windows only]
Also consider MJCompressor [Windows and Mac] and blockfish [Windows and Mac]
Reverb: DX Reverb Lite [Windows and Mac]
Also consider Glaceverb [Windows only], Ambience [Windows and Mac], and Kjaerhus Classic [Windows only]
Tape Saturation: JS Magneto [Windows only]
Also consider Saturator [Windows only] and Voxengo tube amp [Windows only]
Although I haven’t included them the example below, the following plugins are also suitable for a vocal effects chain:
Chorus: Kjaerhus Classic Compressor [Windows only]
Delay: Bionic Delay [Windows only] and Kjaerhus Classic [Windows only]
Limiter: W1 [Windows and Mac]
source : http://www.hometracked.com/