This is a collaborative video editing tool that lets users upload their own footage and edit it either alone or with other collaborators. It requires a sign up
2- Drag in Tape
This is another collaborative online video merging service with which you can drag online videos starting with YouTube onto a 'tape' that can be shared with the world. It requires a sign up.
ViewBix has a free basic version with limited features such as : adding calls-to-action to any video, adding interactive apps, and sharing videos on the web or via Facebook and Twitter.
Overstream is a great tool that allows you to add subtitles to online videos. It is very easy and simple to use. Watch their demo video to learn how to work on it. It also requires a sign up
7- YouTube Editor
WeVideo lets you tell your story with video. It has an online video editing platform that is simple to use and uniquely collaborative.
This is a great video editing tool that automatically turns plain videos into beautifully edited and produced movies, perfect for sharing.