MP4tools is an offshoot of the current version of the popular conversion tools called MKVtools. It is an OS X application used for the creation and editing of MP4 videos. It was primarily designed for processing videos files for use in hardware capable of playing MP4 or M4V videos, such as the iPhone, iPad, Apple TV and PS3. As the name might imply, MP4tools is a graphical interface for a variety of "tools" useful for processing video files.

AVItools is the part of the VIDEOtoolbox Suite of Applications used for the creation and editing of AVI videos. It was primarily designed for processing videos files for use in DivX enabled DVD players, though the AVI videos it creates are also playable on hardware like the PS3 and Xbox 360. As the name might imply, AVItools is a graphical interface for a variety of tools useful for processing video files.

MKVtools is a collection of tools used to manipulate video files. It's primary purpose is to convert mkv files into more user friendly formats for playback on a variety of hardware.