Dallamolo is a program plays notes you programmed from a text file. It has a syntax reader. You can program rhytym patterns and accords with it.
EasyTAG is an utility for viewing and editing tags for MP3, MP2, MP4/AAC, FLAC, Ogg Vorbis, MusePack, Monkey's Audio and WavPack files. Its simple and nice GTK+ interface makes tagging easier.