Don't forget finagle and scalding. At the company I work at, various of the above projects are integral to one system or another (though to be fair, there are

Don't forget finagle and scalding. At the company I work at, various of the above projects are integral to one system or another (though to be fair, there are quite a number of ex-Twitter folks floating around). I'm not a Scala expert, but as far as I can tell Twitter also has a large footprint in that community.