Captioned - Say, show, share. Create a 60 second captioned video.
netadge - NetAdge is a mobile demand-side platform.
Caption - Open-source captioning tool to help find the right subtitles.
Persona.ly - Persona.ly offers game and app developers advanced tools for creating in-app advertising and acquiring quality users.
Ava - Making conversations accessible for the deaf
LoopMe - LoopMe is a platform for all mobile video ad formats, covering pre-roll, HTML5 and VAST, including native and full-screen formats.