Kdenlive is an extremely easy to use video editing application for both amateurs and advanced users.

Kdenlive is the most versatile video editor available today:

* Support for a wide range of camcorders and cameras, including:
* Multitrack edition with a timeline and unlimited number of video and audio tracks.
* Video and audio tracks organized in layers.
* Tools to create, move, crop and delete video clips, audio clips, text clips and image clips.
* Configurable keyboard shortcuts and interface layouts.
* A wide range of effects and transitions. Ability to add custome effects and transitions.
* Non-blocking rendering using a rendering separate application.
* Stop, pause and restart rendering.
* Continue to work on your project without any possible loss of data.
* Export to standard formats:

Similar applications: 
Final Cut, iMovie, Microsoft Windows Movie Maker, Adobe Premiere