Real Alternative will allow you to play RealMedia files without having to install RealPlayer.

All RealMedia formats (.ra .rm .rmvb .ram .rpm .rv .rp .rt .rnx .smi .smil etc.) are supported, including streaming content and RealMedia content that is embedded in webpages.

QuickTime Alternative is a trimmed down version of QuickTime that contains only the essential components needed for playing QuickTime content that is embedded in webpages.

Advantages of QuickTime Alternative are:

  • Quick and easy install
  • Ability to make an unattended installation
  • No background processes
  • No unwanted stuff and other nonsense
  • Smaller size

http://www.codecguide.com/