AIMP is a free audio player with support for large number of formats and playlists. It works with multiple playlists immediately, allows creation of bookmarks and also has a playback queue.

UltraDefrag is a powerful disk defragmentation tool for Windows. It is the first open source defragmenter with full support of system locked files defragmentation. Actually all files including registry hives and paging file can be processed by UltraDefrag during the Windows boot process.