1)   Agile MP4 Video Joiner 2.3.1
Agile MP4 Video Joiner is the most popular video tool that join AVI/MPEG/MP4/MPG/WMV/ASF/MOV... videos to a large one such as MP4/MPEG-4/iPod/iPhone/PSP/Zune.... It merges multiple videos of different formats and supports so many output formats.