Amazon.com: Airstep Play Online Video & Audio Hands-free Controller for YouTube, Mp3 etc. of Playback, Loop, Speed, Pitch Control on Android, iOS, Mac and PC : Electronics
Transpose △▽ pitch ▹ speed ▹ loop for videos
TimeStretch Audio Player - 29a.ch
Audio Pitch Shifter - CodeProject
5 Ways to Change Audio Speed Without Changing Pitch - Gadgets To Use