1)   MediaJoin 3.0
Easily join / combine all popular audio and video formats into a single merged file. Formats supported include MP3, WMA, WAV, OGG, AVI, MPEG-1, MPEG-2, and WMV. Optionally include audio tag information for the combined output audio file.

 2)   JFuse AVI, MPEG Joiner / Mpeg Splitter 3
Joins or splits media files. Merge small movie files together so they can be viewed as one clip.