LosslessCut is a simple cross-platform tool for lossless trimming / cutting of video and audio files. Great for rough processing of large raw videos from a video camera, drone or GoPro. Lets you quickly extract the good parts and discard gigabytes of data. Uses ffmpeg to do the grunt work.
Best video editing software on linux, Blazing fast keyboard oriented workflow, based on ffmpeg. Nothing comes even close to it for quick editing of simple videos.