Lightworks

Back in April 2010, Lightworks announced their plans to take Lightworks open source. They always said the first step would be to make the application freely available so that a large community of users could start becoming familiar with it. They are very pleased to have reached this first milestone. Now you can freely download the most intuitive and advanced editor available. This is not a trial download. From here forward, you will always be able to download and use the latest version of Lightworks for free.

http://www.lightworksbeta.com/