Free AVI MPEG WMV MP4 FLV Video Joiner
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Full user review
"Great little program."
It's free, it joins video and it's fast. Also very simple to use.
Haven't found any.
Tried loads of different programs to try and join mp4 clips together. Trial versions are no good because they limit what you can do. Which means that you have to buy before you know what the full version is capable of. No other free program seemed to work.