AudioDirector 365 is a free voice changer and audio editing software that can record, edit, mix, and restore audio files.
AV Voice Changer gives you endless possibilities for changing your voice's tone, pitch, and sound.
Voicemod - Best for Live Streaming
Voicemod works with video streaming, chat, and AR filter apps. It comes with an impressive amount of voice effects, but it requires an impressive computer to function properly.
Adobe Audition is a professional-level audio workstation designed for video production workflows and audio finishing.