Lumosity - Discover what your mind can do. Improve memory, increase focus, and find calm - with the #1 brain training app. Get started now.
Brain Games - Boost memory power with free brain games
Human Benchmark - A web game to benchmark your brains.
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Elevate - Elevate is an award-winning brain training tool designed to build communication and analytical skills.
Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle