MP3html is a utility for generating listings of MP3 files based on their ID3 tags and information such as bitrate, duration, and file size. Because it makes use of template files and is script-friendly, it can easily be used to create just about any kind of list you can think of, but its most common use is creating HTML lists for Web pages.
fillrio.sh is a standalone shell script that loads random MP3 files to all available memory in your rio. The RIO utility is required to interface with the RIO hardware. Special features of this tool include the ability to recursively scan your music archive directories, specify search strings and add to what's already loaded.
MediaZoo is an online personal media library and player that allows users listen to their music and invite close friends to their music room. Its mission is to allow users, musicians, and developers to start collaborating on creating a unique, open, and free music experience in the cloud.
SmartPlay is a Perl/GTK-based mpg123 frontend with a pseudo-artificial intelligence. Its user interface is very efficent, and it tries to learn from your past listening patterns in order to predict what you want to hear. Both the user interface and AI are designed to minimize the amount of time you spend skipping songs you are not in the mood to hear.