FreeCiv is a turn-based strategy game inspired by the proprietary Sid Meier's Civilization series. Freeciv is free and open-source software. Players take the role of tribal leaders in 4000 B.C. who must guide their peoples through the centuries. Freeciv-web is a version of Freeciv playable online in any modern web browser. It supports 2D isometric graphics or 3D graphics using WebGL.
There are multiple websites, with two primary being freecivweb.com (2D with Longturn focus) and freecivworld.net (3D single and multi-player). You also can play on this very website in experimental 100% in browser experience.
WebCiv.org goal is to democratise FreeCiv Web development so that everyone can easily run and modify it. No need for expensive servers, complex configuration via TomCat and Nginx. WebCiv.org served statically, easy to modify and has minimal maintenance costs.