Humble Bundle offers downloads of the Humble GameMaker Bundle for Windows, MAc, Linux, and Android for whatever you want to pay. If you opt to pay the bare minimum of $1, you'll get GameMaker Pro, Uncanney Valley, Cook, Serve, Delicious!, Ink, Angry Chicken: Egg Madness and Shep Hard, and copies of the source code for Angry Chicken: Egg Madness and Shep Hard, Extreme Burger Defense and Freeway Mutant. That's $175 under what you'd pay for just the playable games included above on Steam.
If you pay more than the average, currently $11.97, you'll also get Gamemaker Studio: HTML5 Module, Home, Solstice, 10 Second Ninja X GameMaker Edition, Galactic Missile Defense, and source code for Uncanny Valley, Ink, Cook, Serve, Delicious!, and Galactic Missile Defense. Finally, pay $15 or more to bag three more GameMaker: Studio modules, Flop Rocket with source code and UWP package, and the source codes for Home and Solstice. Note that not all games are available on all platforms. Deal ends September 20.