Plot: Freeciv is a single- and multiplayer, turn-based strategy game for workstations and personal computers inspired by the proprietary Sid Meier's Civilization series. It is available for most desktop computer operating systems and available in an online browser based version. Wikipedia
Plot: DomiNations is a 2015 freemium mobile massively multiplayer strategy video game developed and published by Big Huge Games. The game was released on April 1, 2015. Wikipedia
Plot: Forge of Empires is a browser-based strategy game developed by InnoGames. The game was initially released on 17 April 2012. In 2013, TV advertising helped the game reach 10 million user registrations. It was later released for the iPhone and iPad in 2014, as well as Android in 2015. Wikipedia