CONV. - Convert YouTube video to MP3, GIF or MP4
Dubsmash - From silly lip-syncing to full featured video messaging 😜
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.
Voice Swap - Live voice changer & face filters for video selfies.
Yout - YouTube to Mp3 Converter
LIPP - Dub your voice over famous videos