@nixCraft We have been using #Jenkins at $DAYJOB for the last ten years. We didn't have any autobuilders set up when I started working here, and Jenkins was the easiest to set up.
It is painfully ignorant of branches in VCSes, which means I have to set up a new builder for every single branch I want to build from, but I've learned to live with it.
Haven't found a good alternative yet, though. Anything that cannot be installed on-premises is not an option.