GSnap - With GSnap you can get an auto-tune effect.
AudioMass - A full-featured web based audio editor 🎶
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
Wavosaur - WAVOSAUR is a free audio editor for Windows with VST plugins support. The program is ASIO compatible, can do loop points edition, auto-trim, noise removal.
CrispyTuner - Fully featured vocal tuning suite.
GoldWave - GoldWave. Digital Audio Editing Software. Record • Restore • Convert • Analyze. Fully loaded to do everything from the simplest recording and editing to the most sophisticated audio processing, restoration, enhancements, analysis, and conversions.