Have you looked at The Lacuna Expanse? I’m afraid I just burned an hour of time playing it instead of doing other things. It’s a pretty neat MMO that combines strategy and SimCity in a fun game with a galactic theme. I was surprised to see how well it is put together for being web based. I’d really recommend checking it out.
If you aren’t interested in the game then you might be interested in the tech behind it. The whole thing is written in Perl and uses a lot of fun tech. Here is a slide deck.