Ezthumb - A video thumbnail generator based on ffmpeg.
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, -
MoviePrint - MoviePrint lets you create screenshots of entire movies in an instant.
Skreenics - Skreenics is a Mac OS X application that is designed to easily create thumbnails from your videos.
Thumbnail me - Thumbnail me is a free and open source thumbnails generator built on the movie thumbnailer binary.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!