For low-latency live use, Graillon 2 (paid) or MAutoPitch (free) are your best bets. Run them in a lightweight VST host like Cantabile (trial) or Element if you don’t have a full DAW.
If you are looking for formal papers on how this technology works, research typically focuses on Digital Signal Processing (DSP) Pitch Detection Algorithms (PDA) autotune realtime x crack extra quality