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The Humble Bundle ended its second pay-what-you-want deal on Saturday. After running for just 11 days, the startup, newly backed by Y Combinator sold over $1.8 million in video games, outperforming the great success the first bundle had earlier this year.

The Humble Bundle lets customers choose the price they wanted to pay - anything from a penny up - to download a package of 5 indie video games. And even though they could have paid just a cent, the average customer spent $7.83 to download the bundle. Some companies, in order to have their names listed as top contributors on the Humble Bundle site, paid several thousand dollars for the bundle. (And for those keeping score at home, Linux users again paid twice as much as Windows users - $13.76 to $6.67.)

There is a fundamental problem that Internet startups face when they begin to grow: scalability. It is imperative to be able to not only handle large flows of data from usage, but also to deploy changes and upgrades to your software across multiple servers as fast as possible. Twitter faces this challenge every day as its farm of servers grows, and today the San Francisco-based company is open sourcing its solution to the deployment problem for all to use.