AddMovie is a utility for concatenating several files into one single movie, or batch converting movies to other formats. Supports all formats provided by Quicktime. Since the output format is configurable, you can also use AddMovie to convert movie file formats, say from MPEG-4 to 3GP for display on your Bluetooth phone, etc.

WHAT’S NEW
Version 1.4.1:
AddMovie now supports dropping URLs from your browser into the file list window. AddMovie will download the URL, and if it is a valid file, such as a movie or picture, AddMovie will add it to the file list window.
Use the preferences window to specify the directory where downloaded files will be saved. You can also specify if files by the same name will be overwritten. The default download directory is your Internet download directory.
AddMovie will now chapterize and flatten (make self-contained) combined movies by default.

Download : AddMovie 1.4.1