Bioman Biology offers a range of free flash based, or iPad app, games and virtual labs. Student play can be linked to teacher accounts for recording scores. Designed primarily for middle school students, these would be great refresher courses for high school students.
Photozeen is billed as the “first educational platform for amateur photographers.” Photozeen connects people who are passionate about photography with people who want to learn to be better photographers. Choose your photography quest, and you’re on your way to improving your photography skills.
Soundtrap is a great web based tool for creating your own music, collaboratively. Use your own instruments or use Soundtrap’s virtual instruments. Never worry about copyright again when scoring your presentations.