Cyber Nations is described as 'Cyber Nation is a free online nation simulation game. Interact with other players while you build and defend your empire'. There are six games similar to Cyber Nations for Online / Web-based. The best alternative is NationStates, which is free. Other Cyber Nations like games are Politics & War (Freemium), eRepublik (Free), War of Republics (Free) and Fantasy-Sim (Free).
Fantasy-Sim is a massively multiplayer online strategy game in which players can join a country and join the economy module by buying companies and hiring other players. All modules are highly interconnected and influence eachother.