RealPlayer plays streaming audio and video over the Internet in real-time. It plays RealAudio, RealVideo, MP3, 3GPP Video, Flash, SMIL 2.0, JPEG, GIF, PNG, RealPix, RealText, Ogg Vorbis, and Ogg Theora. It is available for Windows, Macintosh, Pocket PC, Nokia 9200 Series, Nokia 7650, Palm OS 5-based handhelds, Linux, Solaris, and many Unix variants.
Apple QuickTime allows users to create, play, and stream audio and video content over the Internet. Features include playback of MPEG-4 video, AAC audio, and Instant-On media, easy-to-use controls, bass and treble controls, balance control, streaming media support, the ability to save movie favorites, as well as the ability to view VR and interactive content. The Pro version also includes an AAC encoder.