A popular, low-latency alternative often found at a lower price point than the full Antares suite. You can check it out at Waves Audio MAutoPitch (Free):
The T-Pain Effect Plugin is a vocal processing plugin that allows users to create a unique, pitch-shifting effect on vocals. The plugin uses advanced algorithms to analyze the audio signal and create a robotic, synthesized sound. The plugin features a simple interface with controls for pitch, formant, and volume. The plugin can be used on a variety of audio sources, including vocals, instruments, and even full mixes. T Pain Effect Plugin Crack