Zina is a graphical interface to your MP3 collection, a personal jukebox, a Podcaster, and an MP3 streamer. It includes an optional Flash player, a tag editor, and can search the Web for album art and song lyrics. It can run alone, be embedded into an existing Web site, or be used as a module in Drupal, Joomla, and Wordpress.
CrutziPlayer is a standalone player for NPAPI-based browser plugins (e.g., Flash). It provides external, hardware accelerated fullscreen scaling using XComposite, Cairo, and XFixes. It's a good solution, for example, for playing browser games fullscreen on Linux, as it autodetects the original .swf content size.