The Participatory Culture Foundation (PCF), a member of the Prosperity4All project along with AGE, developed a free open source platform for captions and subtitling. This new service named Amara aims at greater accessibility for videos.
The Amara platform gathers a community of people that is invited to participate in captioning and translating community projects. It is free for the public to use and includes space for partners and clients to manage their own communities (e.g. Vimeo).
Discover Amara in this video: https://youtu.be/aQ-xe-GSjdA
For more information, visit the Prosperity4All website