Ezthumb - A video thumbnail generator based on ffmpeg.
Video Thumbnails Maker - Allows you to make thumbnails (caps, previews, screen-lists) and screenshots of video files.
MoviePrint - MoviePrint lets you create screenshots of entire movies in an instant.
Auto-Movie-Thumbnailer - AMT - Auto-Movie-Thumbnailer v11 THE Batch Movie ScreenCap Creator... Create ScreenCaps of - any number of movies, - located anywhere on your computer, -
Skreenics - Skreenics is a Mac OS X application that is designed to easily create thumbnails from your videos.
Thumbs - Thumbs is your new personal assistant for movie stills and thumbsheets.