AVT ChapterIt is a powerful tool to add and edit chapters of video files. Those chapters work with most of the Players under Mac OSX as well with iOS-Devices, like iPad or iPhone.
You can manually add, edit or remove chapters or use the built-in functions to automatically add chapters. If your movie fades to black between different parts you can let ChapterIt find those black frames to place the chapters there. Of course you can also import chapters.
Supported Video file types:
QuickTime movies (mov)
MPEG4-movies (mp4, m4v)
Matroska (mkv) (planned for next release)
Import chapters from:
TEXT or XML files, including FCPXML
QuickTime, MPEG4 or Matroska videos
DVD (.ifo files)