by DigitByte Studio AVI Joiner is an easy-to-use tool for joining several AVI files into bigger one. It is fast, without recompression and quality loss. Only the AVI files, which have same frame rate, frame size, video codec and audio parameters, can be joined.
by Bobyte Software AviSplit is an application for cutting and rejoining AVI/DivX files. Whether splitting, rejoining or clipping, AviSplit is very fast as no data processing is involved (lossless). Generally, using Avisplit is about as fast as copying the file itself!