Nothing like KODP, where you're relegated to one village (at least for a very long time).
Building a Glorantha-based mod would be fairly easy... there's a map editor included... but again, it plays like a Civ game. If you're still interested in something like that, I suggest the Rhys and Fall mod, which is based around the Bronze Age of our own history, and is downloadable from several sources (or, if you get the Civ 4: Beyond The Sword expansion, is included on the install.)
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