Why not spend the hot Summer months by speed running some games from The  Summer Games Done Quick Bundle raising money for Doctors Without Borders.  With a donation of just $25 or more you will receive over $90 worth of games.  100% of the funds raised will go to charity.  The bundle includes Amnesion: A Machine for Pigs, Gunpoint, Noitu Love 2 Devolution, Bleed, Electronic Super Joy, Guacamelee Gold Edition, Psychonauts, Dustforce, The Basement Collection, and the Giana Sisters: Rise of the Owlverlord all game are DRM Free.  The Bundle will run from June 22nd to the 28th.  

Source: Humble Bundle SGDQ