Rocksmith+ - Rocksmith builds off of the fundamentals of music games like Rock Band and Guitar Hero by offering fundamental lessons in actually playing guitar.
Community Questions for Confluence - Keep questions and answers in one place with an engaging, community-driven Q&A discussion forum, powered by Confluence
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
Stack Overflow for Teams - Everything you love about Stack Overflow in a private space.
World in Audition - World in Audition is an Addictive, Dancing and Music Simulation.
Question2Answer - A Q&A site helps an online community to share knowledge.