Humble Bundle offers downloads of its Humble Bundle 3-Game Indie Bundle for Windows, Mac, and Linux for whatever you want to pay. If you opt to pay the bare minimum of $1, you'll get Ziggurat, Windward, and SteamWorld Heist. That's $39 under what you'd pay for these games separately elsewhere.
If you pay more than the average, currently $7.50, you'll also get Kentucky Route Zero, Beholder, and Goat Simulator: GOATY. Finally, pay $13 or more to also get Owlboy Soundtrack. Your contribution can be donated to charity (Electronic Frontier Foundation and Child's Play), the developers, or both. All games are available DRM-free and via Steam. Deal ends May 30.