OpenTTD

simutrans   (Compare Project)

High Activity

Mostly written in C++

License: Unknown

Spring RTS Engine   (Compare Project)

Very High Activity

Mostly written in C++

License: GPL-2.0+

osm-py   (Compare Project)

Activity Not Available

License: BSD-4-Clause-UC

Globulation 2   (Compare Project)

Very Low Activity

Mostly written in C++

License: GPL-3.0, GPL-3.0+

Scorched 3D   (Compare Project)

Very Low Activity

Mostly written in C++

License: GPL-2.0+

Stendhal   (Compare Project)

Very High Activity

Mostly written in Java

License: GPL-2.0+

Unknown Horizons   (Compare Project)

Very High Activity

Mostly written in Python

License: GPL-2.0+

Spring: 1944   (Compare Project)

Moderate Activity

Mostly written in Lua

License: CC-BY-NC-3.0

Bos Wars   (Compare Project)

Moderate Activity

Mostly written in C++

License: GPL-2.0+

OpenDungeons   (Compare Project)

Moderate Activity

Mostly written in C++

License: GPL-2.0+

XMoto   (Compare Project)

Very Low Activity

Mostly written in C++

License: GPL-2.0+

Freeciv   (Compare Project)

High Activity

Mostly written in C

License: GPL-2.0+

FreeCol   (Compare Project)

High Activity

Mostly written in Java

License: GPL-2.0+

Pingus   (Compare Project)

Very Low Activity

Mostly written in Scheme

License: GPL-2.0+, GPL-3.0

UFO: Alien Invasion   (Compare Project)

Very High Activity

Mostly written in C++

License: CC, GPL-2.0+

Globulation 2   (Compare Project)

Very Low Activity

Mostly written in C++

License: GPL-3.0, GPL-3.0+

FreedroidRPG   (Compare Project)

Moderate Activity

Mostly written in C

License: GPL-2.0+

Vega Strike   (Compare Project)

Moderate Activity

Mostly written in C

License: GPL-2.0+

Teeworlds   (Compare Project)

Moderate Activity

Mostly written in C++

License: BSD-3-Clause

DOSBox   (Compare Project)

Low Activity

Mostly written in C++

License: GPL-2.0+