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.
MicMonster - Future of voiceover
Yout - YouTube to Mp3 Converter
MadLipz - Create, view & easily share funny short-form video parodies