Patrician 3 is a trading strategy game with some city building elements. I suspect there are other, better games of this type out there, but this one is very good for running on low-end system (i.e. my work machine :D ).
I rather enjoy it, but it can be a bit … complex. So I’m trying to put together a strategy guide, using information from http://www.rjosephs.de/patrician/etools.html and http://www.citybuildergames.com/index.php?topic=1284.0. Thanks to the original people who figured this stuff out, who I haven’t asked for permission yet I’m afraid.
Unfortunately, at about the time I started this, I realized that Port Royale 2, which is basically the same game, runs on my work machine. :)