Ant Movie Catalog is a free (really free, i.e. the source code is available) program made to manage your collection of movies on DVD, CD (VideoCD, DivX, ...) and tapes. The project was started by Antoine Potten in 2000, and improved by Mickal Vanneufville since 2011.
Browse the links above this text to get more information and download the program.
If you use GNU/Linux rather than Windows, you can try to use WinE to get this program running; some people notified me that this was working. You can also check Moviefly, which is a complete rewrite of Ant Movie Catalog made with Python.
Ant Movie Catalog is an extremely easy to use application. Its fast and doesnt suffer from crashes. Its a very stable piece of software that eliminates the need for users to create a database of their own just to inventory their movie collection.