Recs.
Updated
Specs
Pros
Pro Bundles
Humble Bundle offers bundles of games for pay what you want pricing. These happen quite often with indie bundles, publisher bundles as well as weekly bundles. There are different tiers to the bundles that go higher in price depending on how many games one wants from the bundle. The higher tiers have a higher price floor but still offer considerable discounts on games. All bundles payments can be put towards a charity for that bundle as well as towards the developer or the HB themselves.
Pro Pay what you want
The way Humble Bundle works is that it is donation based in that you can pay what you want for the bundle, with the minimum being a dollar. There are separate packages in each bundle that also ask for a minimum price, which depends on the "beat the average" price which is what on average has been donated so far.
Cons
Con Good guy cred from charity doesn't pay devs
Humble basically has a moral high ground shield and its bundles trigger the idea that discounts are charitable towards the buyer and that everybody wins. This is not true. Most people don't fiddle with the sliders and money going to charity isn't going to someone else (and hint, it's not taken from Humble's cut).