MKVToolnix is a set of tools that will help you create, alter and inspect Matroska files under Linux, other Unices and Windows.

They do for Matroska what the OGMtools do for the OGM format and then some.

Window Media Player Classic is an enhanced version of Windows Media Player 6.4.

This program allows you to play DVDs with the help of external decoders like WinDVD and it can also play Realmedia files, if realplayer one is installed.

VLC media player is a highly portable multimedia player that supports various audio and video formats (MPEG-4, MPEG-2, MPEG-1, DivX, mp3, ogg, …) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.