In Universal Audio's UAD 9.2 update Antares Autotune Real Time was introduced allowing live processing and pitch correction of vocals (or other inputs) in real-time. As well as AutoTune Realtime plug-in ($249), there is also the Eden WT800 Bass Amplifier ($149), Fuchs Train II Amplifier $149, SSL 400G Bus Compressor collection $299 and the Pure Plate Reverb $149.
In this video Tosh form Wij Productions, focuses on the AutoTune RealTime plug-in and applications for processing live and recorded vocals.
UAD plug-ins run on the UAD powered plug-in platform, there are various models to choose from with various DSP and audio IO configurations.
Antares Autotune was the first and most widely used aut tuning plug-in, launching (and preserving!) the careers of many and introducing a whole new sonic palette foe vocals to the producer.