FFmpeg - Open source multimedia suite for conversion, playback, profiling, and streaming.
UbuntuStudio - Ubuntu Studio is a multimedia editing/creation flavor of Ubuntu.
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
KXStudio - KXStudio is a collection of tools and tweaks, targeted at audio and video production.
Freemake Video Converter - Freemake Video Converter Converts 500+ Formats & Gadgets FREE! Convert to MP4, AVI, MKV, WMV, DVD, Xvid. FREE Download. **Voted Best of 2018** Comes with FREE…
LibraZiK - Digital audio production distribution based on Debian.