Glest

Glest is a free and open-source real-time strategy computer game from 2004. "Glest" is set in a medieval fantasy world with two factions, and was compared with Warcraft III and the Empire Earth series. The game received positive to mixed reviews from the press, has been downloaded over two million times, and spawned several derivative continuation projects which are under active development.
Development.
The game was started by a team based in Spain around 2004.
Release of version 3.0 added online multiplayer LAN/Internet support. "Glest" is designed to be moddable, with game elements defined by editable XML files, and includes a map editor.
Since April 2009, development on the original game has ceased. However, two forks, "MegaGlest" and the "Glest Advanced Engine" (GAE) have continued developing the game and its engine further. While "MegaGlest" is focused on stable releases which provide reliable cross platform multi-player games and deliver new game content out of the box, "GAE" is primarily oriented towards improving the game engine and providing more options for full conversions, and is more experimental in nature.
In 2011 it was suggested that the two forks should merge but due to different philosophies and goals amongst the developers of both forks this effort was called off during the planning stage.
Gameplay.
"Glest" is set in a medieval fantasy world with two factions, named "Magic" and "Tech", each with their own set of units, buildings and upgrades. The Tech faction uses traditional human warriors and has medieval mechanical devices in its arsenal, and are strong in melee combat. The Magic faction is designed for advanced players with most of their units morphed from or summoned by others. It lacks the hand-to-hand combat strength of the Tech faction but features more versatile units. Tilesets and maps are selected at the new game setup menu and determine the graphical nature of the "Glest" game world.
Because of the moddability of the engine, "Glest" can play games from a variety of player-created mods. These range from futuristic science fiction themes to dark, high fantasy settings.
Reception.
By July 2016 Glest had been downloaded on Sourceforge alone over 2,300,000 times.