HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
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.
SMPlayer - SMPlayer is a free video and audio player for both Windows and Linux that allows you to play almost all media files without having to install additional codecs. Read more about SMPlayer.
Shutter Encoder - Open source software without any restriction - converter all formats video|audio|image professionnals codecs and standards - swiss knife tool Windows, OSX and Linux
MPV - MPV is an audio and movie player based on MPlayer and mplayer2.