FFMPEG is an open source and really powerful audio/video processor. You can do a lot of different things with ffmpeg. One of which is to cut video. Below are some examples to see how you can cut video with free ffmpeg.
ffmpeg -i [input_file] -ss [start_seconds] -t [duration_seconds] [output_file]
Cut Video without Re-encoding the video file :
ffmpeg -i source.mp4 -ss 00:00:05 -t 00:00:10 -c copy cut_video.mp4
ffmpeg -i source.mp4 -ss 00:00:05 -t 00:00:10 -async 1 -strict -2 cut_video.mp4