All of oTranscribe's custom-built components, as well as the app itself, are open source under the MIT license. Pull requests and forks are welcomed, or feel free to use these libraries in your own applications.
A bring-your-own-interface media player component that supports audio, video and YouTube videos. Accepts URLs or HTML5 File objects. Goes very nicely with oTinput.
Lightweight, customisable progress bars for HTML5 video & audio. Subcomponent of oTplayer.