FreeCol is an open version of Colonization. It is a Civilization-like game in which the player has to conquer the new world.
Here is the "What would Col1 do?" wiki page.
Colony panel (FreeCol 0.10.0)
Europe panel (FreeCol 0.10.0) Italian/Black Chancery
Mapboard 1024x600px with borders showing
Mapboard with modern labels (FreeCol 0.10.0)
Mapboard with new tile set and compass (OpenJDK)