[ale] substitutes for MS Media Player & QuickTime Player ?

Are there Linux substitutes and if yes, how compatible are they   ?

Thank you,
Courtney

Follow-Ups:
- [ale] substitutes for MS Media Player & QuickTime Player ?
  - From: preston.lists at gmail.com (Preston Boyington)
- [ale] substitutes for MS Media Player & QuickTime Player ?
  - From: danverde at comcast.net (danverde)
- [ale] substitutes for MS Media Player & QuickTime Player ?
  - From: bpitts at LearnLink.Emory.Edu (Brian D. Pitts)
- [ale] substitutes for MS Media Player & QuickTime Player ?
  - From: preston.lists at gmail.com (Preston Boyington)