Frankly, I have tried many tools in current market. If you're looking for a free video trimmer to only cut big files, most of the online freeware can suit.
However, as you said about "without re-encoding", that means no quality loss after cutting. In this case, I will suggest Joyoshare Video Cutter in your list.
It comes with free chances to allow you cut and trim kinds of videos and audios fast and losslessly.