HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Ciano - A simple multimedia file converter for elementary OS.
ImageOptim - Faster web pages and apps.
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!
TinyJPG - Compress JPEG images with perfect quality and file size