RAD Game Tools. I'm following the owner and some of the employees and these guys seem to really take writing software seriously (probably in part because in the

RAD Game Tools. I'm following the owner and some of the employees and these guys seem to really take writing software seriously (probably in part because in their domain, if they sell crappy annoying middleware, their clients will just not buy it - the purchases are not driven by MBAs). Also, the people that work there are absolutely top-notch technically. Thirdly, what they work on is interesting and challenging.