There’s a Mac beta for Lightworks, a full-featured video editor. More on the Mac Beta of Lightworks.
There is also a Linux beta that has been out a few months.
The pro version will be for purchase but there’s a free version for Windows that has been out a while, allowing for only exports of MPEG-4 (Web, YouTube and Vimeo) and the maximum resolution is 720p. Download it here.