Kdenlive is a non-linear video editor for KDE. It provides all project management and editing tools while relying on a separate rendering framework (currently MLT/FFmpeg) to perform the editing operations. Kdenlive provides dual video monitors, a multi-track timeline, and clip list. Other features include customizable layout support, basic effects and transitions, multiple file formats, and full project and asset management support. Editing in Kdenlive is possible with various tools via the timeline and video monitors, allowing you to move and resize one or more clips, and razor clips into two. All timeline tools can snap to clip start/ends and the current seek position. You may playback/preview the contents of the timeline at any point during the edit. Kdenlive communicates with a render engine which handles the actual video data.
iVideo is multitrack video editing software, created in Cocoa (Objective-C) and using QuickTime. It was developed for all general video purposes, and to include all of the features of QuickTime Pro and iMovie. It is almost complete; you can import video from digital cameras (using FireWire) or from any QuickTime format supported file, then edit, modify, and mix them, and apply any video effect on or between them. You can then export them to any QuickTime supported format.