Well, obviously it's not open source, but GH Enterprise is delivered as a running Ruby app, so you can take a look. Of course the TOS says you shouldn't read o

Well, obviously it's not open source, but GH Enterprise is delivered as a running Ruby app, so you can take a look. Of course the TOS says you shouldn't read or reverse engineer or whatever. But I know people fix bugs that GitHub won't fix in their enterprise product by patching the Ruby source after each new update.