ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
Any Video Converter - Any Video Converter is an All-in-One video converting tool with easy-to-use graphical interface, fast converting speed and excellent video quality. It allows you to effortlessly convert video files between every format!
Ralpha Image Resizer - High-speed image batch conversion tool
Selene Media Converter - Selene is an audio/video converter for converting files to various formats.