Open Video Joiner 

Open Video Joiner is a tool for joining all kinds of video files such as MPEG (MPG), AVI, ASF, WMV into one large avi file with transition effects. It uses open compression system for video and audio. It can encode AVI file with DIVX, XVID,etc.
video joiner movie joiner join mpeg join avi join wmv join asf merge mpeg merge avi merge wmv merge asf

JFuse AVI, MPEG Joiner / Mpeg Splitter 

Joins or splits media files. Merge small movie files together so they can be viewed as one clip.
mpeg joiner avi joiner avi merger combine avi combine mpeg combine mpg cut mpeg cut mpg divx joiner divx merge divx merger join avi join divx