MPlayer (a popular video player for linux) package for maemo. A simple GUI is also included. Provides the best playback performance for mpeg4/divx/xvid video on Nokia 770/N800, can use subtitles.
Kagu is a playlist based music player with A2DP and maemoscrobbler support, finger friendly inertial scrolling, theme engine, and intelligent screen/battery usage optimizations.
MediaBox is a media center for the N800. Features include: mplayer embedded, video player with video thumbnails, music player with album cover art, image viewer with image thumbnails, FM radio, smooth kinetic scrolling.
Streamtuner (maemo port) is a point-and-click GUI browser for the thousands of Internet radio streams available today. It lets you play streams and manage your favorites in a single window -- like a Linux tuner for Internet radio.