ChurchBells BellTower carillon chimes system for $140 (Home Lic $35) Great outreach ministry
Home Group Overhead Sing along with God! Overhead Slide Projection Program Displays Lyrics really huge on the screen in real time as Worship Music is Sung. You don't need a projector and you don't need any expensive software to lead the words of worship.
4BlindMice Real Time Screen Reading talking mouse works with existing reader to provide GUI. Run your hands over the screen and get the big picture. Drive your mouse full speed across the screen, knowing in real time where you are and what you're flying over.