Battle of Wesnoth

Battle of Wesnoth is an excellent open-source turn-based strategy video game with a fantasy setting. This game is designed by David White. It is released in June 2003. It is released under the GPL license in the source. It is supported across platforms, it is translated into different languages. It is a tactical game. You need to move the units around in order to defeat your enemies. It takes some doing with several units on the go at once. It consists of 200 units and 6 factions and 16 different tribes.

Features of Battle of Wesnoth

It provides several multiplayer options.
It provides the support of internet play.
Provide support of up to 54 languages.
Enrich with custom-designed maps and unlimited random maps.
It consists of a fighting force, starting from a single leader and a small amount of gold.

Magarena

Magarena is a single-player, open-source game. It is a fantasy card game played against a computer opponent. It applies rules enforcement like Forge and has a great AI. It comes with an excellent user interface. It allows you to select them from a variety of user-created skins. It supported cross-platform like Windows, Mac, Linux operating systems, and it is developed under Java language. The original author of this game is Forge.

Features of Magarena

It is fully enforced the rules.
It provides 900 cards to build the decks.
It provides the support to undo the move.
It runs on the minimum screen resolution of 1024x768.
It enables you to change its look and feel using themes.
It supported multiple themes.

0 A.D

0 A.D is an open-source real-time strategy game. It is a developed international group of volunteer game developers- Wildfire Games. It is a strategy game based on a historical war economy game focusing on the years between 500 B.C. It is supported across platforms like Windows, OS X, and Linux. It is released under the GPL 2+ license.

Features of 0 A.D

It provides the features of single-player and a multiplayer mode.
It provides the ceasefire game mode.
It Increased maximum map height
It consists of conquest structures conquest units.