HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
Ralpha Image Resizer - High-speed image batch conversion tool
dmMediaConverter - FFmpeg GUI
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Format Factory - Format Factory is software that allows the user to convert media into various file formats. The software is a product of PC Free Time, a Chinese software development company. Read more about Format Factory.
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.