This software,
Aiseesoft Video Converter is great. It converts ANY video of ANY format to another format. And there are many customization and editing tools in it. This is great for converting your DVDs or downloaded movies to a format compatible with Xbox 360, portable phones, iPhone, the web, etc. etc. This is not a trial or adware/spyware/virus. I use it all the time and I love it.
Here are links to some other good video software,
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DVD Fab HD Decryptor (DVD Ripper/Burner)
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DivX Create (DivX Player, Codec, Converter)