JRiver Media Center is a complete solution for multimedia files. Having just it installed, you won't need other programs, each one for a specific task, as JRiver Media Center has all the functionality you need.
With it you'll be able to play any multimedia file, as well as having at your disposal a cataloger and file organizer.
The software is also capable of synchronizing content from different devices such as cell phones and cameras.
JRiver Media Center has a look that resembles iTunes, but you can customize it through skins.