Pluginboutique is the place where the best music software companies come to sell their VST Plugins, Virtual Instruments, Synth Presets and Music Plugins to Producers, Musicians and DJs worldwide. Customers can browse Best Selling and Top Rated plugins and can download Free VST Plugins, Demos and Trial Versions before purchasing. ClipShifter is a wave shaping audio Mastering VST plugin that functions like a clipping-style limiter, and can be used at all mixing stages, from distorting basses and drums to maximizing mix buses and warming up mixes. /metal-guitar-amp-vst-free.html. IZotope Vocal Doubler Free VST Plugin For Vocals iZotope vocal doubler is a free VST plugin for vocals, allows any users to Double the vocals, half the time. Great free VST plugin. MCompressor Free VST Plugin for Crystal Clear Sound.