First off, others have pointed out that these are 3rd party software companies providing the tools.
I'd like to talk about your other point though:
> I’ve never met a skilled developer willing to work for what the government pays
So there are a lot of very skilled developers working for the government right now. I'd agree you probably haven't met them. I've found that people who work for the government, especially on TS/SCI systems, do not go out and "network". They usually can't or won't talk about their work. Yes they get paid far lower than what they'd get from a SV startup, but maybe people aren't solely motivated by money. There are some nice things about working for certain parts of the government. First off, there is excellent job security. You pretty much never have to worry about getting fired, it isn't even in the back of your brain. Comparing that to a startup where you are almost always out of breath being worked too hard and you have that fear every day your job is going to disappear. Second, while the pay not be totally up to par, it also isn't bad. The hours are also great, there are laws that govern contracts and projects that limit employees to 40 hours per week. You will not be asked to work over that, even in "crunch" time, because it breaks competition laws when contracts are offered up to outside agencies who put in bids to do the work. Lastly, and most importantly, there is often a sense of pride or duty involved in the job. I know HN isn't exactly the most rah-rah-yay-government crowd, but there are a lot of people out there who have a desire to serve the public somehow. They believe they can do more good on the inside compared to those on the outside who just simply complain about the government.