We-Video website
There is a free version of this that you can try out which gives you the following:
1GB storage, 360p resolution, 15 export minutes per month, Export to Facebook, YouTube, Vimeo and Twitter, 5 invites per project, 390 licensed music titles.
To increase all these, you can go for a paid package.
https://www.wevideo.com/about
Here's a useful write-up and review about We-Video:
http://www.streamingmedia.com/Articles/Editorial/Featured-Articles/WeVideo-Review-The-Top-Browser-Based-Editor-but-Still-Limited-79260.aspx