The Atlantic (in Sep 2013) describes Neuroracer, a game that can help you rebuild your attention span; supposedly. Further online search finds that the game is not available to the public. They mention a company that produces a game based on their finding; it looks like it’s essentially the same people but they’re not selling to the public either.
onethingwell is an amazing blog that keeps displaying amazing small programs that “do one thing well” in the Linux spirit. The platforms vary, however. I have found a few amazing applications there already. If only it wasn’t tumblr-based 🙂