- Braid
- Cortex Command
- Machinarium
- Osmos
- Revenge of the Titans

You get to decide how much you want to pay and what your money goes to (The developers, Electronic Frontier Foundation, Child's Play Charity, the company running the website or a combination of these). I don't know how long the bundle is available, so get yours while it is available.
http://www.humblebundle.com/?live