wxMusik is a fast and lean music library player for Windows and Linux. It supports MP3, MP2 , Ogg, APE, MPC, and FLAC, WAV, and AIFF formats on all platforms and WMA on Windows. It features powerful dynamic playlists that use SQLite, supports listening to Icecast and Shoutcast streams in a reliable manner, and has a nice cross-fading feature and a really cool autodj feature.
iTunes Export provides the ability to export iTunes Playlists to the standard .m3u file format. Unfortunately, this feature is not included in the iTunes application and is extremely useful for users who wish to use iTunes with other applications or devices. iTunes Export is written in C# (.Net). iTunes Export provides a Command Line version (tested on Mono) and a GUI version, as well as a library that developers can use in their own applications.