Lumosity - Discover what your mind can do. Improve memory, increase focus, and find calm - with the #1 brain training app. Get started now.
Brain Pump - Random educational videos. Learn something new.
Brain Workshop - Brain Workshop is a open-source version of the dual n-back brain training exercise.
Bushido Bear - Defend your forest against endless waves of evil demons
gbrainy - gbrainy is a brain teaser game and trainer to have fun and to keep your brain trained.
Lexica - An open source word-search game.