Metronaut - An app to help you play classical music
Draw.Chat - Anonymous real-time whiteboard with text and video chat.
Flat for Education - The best way to teach music to your students
Microsoft Whiteboard - The canvas where ideas, content, & people come together.
Scribd Sheet Music - All the sheet music, books and comics you want for $9/month
Explee - Explee allows you to make eyecatching and interactive animated video.