Bard - Video Assembler is described as 'Bard lets you find a video, re-arrange the words that you want, and merge them to create a new clip'. There are four alternatives to Bard - Video Assembler for Online / Web-based, iPhone, Android and iPad. The best alternative is Playphrase.me, which is free. Other great apps like Bard - Video Assembler are Yarn.co (Free, Open Source), Comb.io (Free) and Clash.me (Free).
Clash.me lets you assemble soundbites from text input by combining multiple sources. Basically, you enter some text and the web app pulls audio and video snippets from popular sources to create an entertaining mashup.