Humble Bundle offers downloads of the Humble Spiderweb 4-Game Bundle for Windows and Mac for whatever you want to pay. If you opt to pay the bare minimum of $1, that's $9 under the lowest price we could find for just one of these games elsewhere. It includes The Geneforge Saga, Avadon: The Black Fortress, Avernum: First Trilogy (pictured), and Spiderweb Game Art and Hint Books. If you pay more than the average, currently $3.75 as of posting, you'll get Nethergate: Resurrection and Avernum: Escape from the Pit as well. Your contribution can be donated to charity (Child's Play or the Electronic Frontier Foundation), the developers, or both. Deal ends July 18 at 1:59 pm ET.