SACAD is a multi platform command line tool to download album covers without manual intervention, ideal for integration in scripts, audio players, etc.
Blood Machines has meh acting and plot, but a gorgeous aesthetic and amazing soundtrack.
Take control of your music and set up this DIY project and enjoy your music collection everywhere using free and/or open-source programs.
Fontasia and MediaHuman Lyrics finder are great utilities that do one thing amazingly well. And crossplatform!