You get some new games and charities get some money. It's win-win for everyone involved! The charities include: Gaming for Good, WWF, and Worldbuilders.
With games like FTL: Faster Than Light, The Whispered World, and Waking Mars as part of the action, the games are certainly titles to appeal to gamers of all types, but the fact that GOG.com is spending money of their own to make sure that 100% of every donation goes straight to charity is also a big deal. In order to make sure that a $5 donation doesn't end up becoming a $5 donation minus credit card fees, VAT, and other expenses, the independent digital distributor will be spending nearly $0.25 on every dollar raised to make sure that every $5 donation equals $5.00 given to charity.
WWF, of course, is one of the largest and best known ecological charities in the world, but the other two charities involved in this fundraiser are perhaps less well known. Worldbuilders is a charity that raises funds in support of Heifer International--an international charity dedicated to eradicating poverty and hunger around the world--and is run by New-York Times Bestselling author Patrick Rothfuss (The Name of the Wind, and Wise Man's Fear). Gaming for Good is run by YouTube gaming personality Athene, and has already successfully raised more than 6 million dollars for Save the Children, an international charity that serves impoverished, marginalized and vulnerable children and families in nearly 120 countries.
For every game you add to purchase, the cost will increase. However, you can manually increase the amount you wish to donate at any time. Even if you're still just getting three games, you can donate however much you want to.
Head on over to GOG.com for more details and for some great savings on games and to donate towards charity.