Rock Band - Rock Band is a Rhythm Music and Single and Multiplayer video game created by Harmonix and published by MTV Games.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
World in Audition - World in Audition is an Addictive, Dancing and Music Simulation.
Askalot - Askalot is a next generation CQA (Community Question and Answer) system.