Island Tribe is a resource management game in the same vein as the Roads of Rome series, also by Realore. However, Roads of Rome has much superior graphics and more interesting scenarios. I only played through the demo portion of Island Tribe, so I did not experience any of the crashing mentioned by other reviewers of Island Tribe, but I bought the full versions of all three Roads of Rome games and they were stable applications and a lot of fun.
I would also recommend Northern Tale, another Realore offering, before I would recommend Island Tribe.
Building the Great Wall of China by Nordcurrent looks to be another game very similar to the Roads of Rome series, possibly even with some graphics by the same artist.
Other resource management games to check out are the Royal Envoy series by Playrix, the My Kingdom for the Princess series by Nevosoft, and Townsmen by Handy Games.