The free open source tool MoviePrint (OS X/Windows) is extremely useful for a variety of applications - it creates a "MoviePrint" for movies, a kind of contact print of a movie, i.e. an image which is composed of a variety of screenshots from the movie. For example, you can easily get a visual overview of the color mood of a film, recall a film including special scenes or analyze the structure of a film - be it as a grader, editor, film collector or critic.
Free tool MoviePrint automatically creates posters from film scenes
MoviePrint 0.2.2 offers a number of options that can be used to determine the resulting contact sheet, such as the number of rows and columns (and thus the size) of individual images, the resolution of the MoviePrint or whether the timecode should be displayed. You can also use in and out points to create a MoviePrint for only a part of the movie and manually add or hide thumbnails.
Since the last version a lot has changed - especially interesting is the new possibility to determine the used film frames not by time interval but by automatic scene change analysis. If desired, the width of a thumbnail can represent the length of a movie scene. Image Batch processing now also allows a MoviePrint to be created automatically for many films one after the other.
A related, but simpler tool is the Movie Bar Creator (Windows), which creates a kind of barcode from the scenes of a movie and makes the color mood of a movie visually vivid.