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Are there any YC startups based around open source software?

My answer to Are there any YC startups based around open source software? on Quora

There have been a few.

Meteor.js is the most obvious example (YCS11, fully open source, raised $11.2 million): Meteor Raises $11.2M Round Led by Andreessen Horowitz.

Reddit have released all of their source code though I’m pretty sure they did that long after they went through YC: reddit on GitHub

DotCloud (YCS10) have pivoted to focus on Docker, which is fully open source.

If you browse through the list on Y Combinator Company List you’ll certainly find some others.