Avalon Hill's Advanced Civilization is a web version of the original board game by Avalon Hill.
Three to seven human players (in hotseat mode, which can be played by just one human) and optional added AI players to total no more than seven nations. Move your tokens and ships around the English Channel, the Mediterranean, and the Middle East, build cities, and collect and exchange goods and technologies. Suffer the occasional disaster and decide which other nations should share in the trouble!
Free to play on FreeGameEmpire, but it's short of explanations. Abandonia.com has the original (1981) manual as PDF.