Posted about this game some time ago, decided to re-post this open source game for updating the links and for the good selections of mods.

TripleA is a free turn based strategy game and board game, similar to Risk, or Axis & Allies. Known for its multiplayer on the online lobby, it also allows Play-By-Email and network (LAN) play, as well as single player vs AI or hotseat. It has over 100 games and maps that can be downloaded from the user community. It is open source, needing only Java 8 to run (can run on Windows, Mac, Linux, etc). Supports savegames, encrypted dice gen, low luck, and other options. Recreate World War 2 with the Axis pushing through to Moscow and Japan devouring the Pacific, or recreate Napoleon‘s march across Europe, or Rome defeating the Carthaginian Empire, or even Sauron conquering Middle Earth, or Zombies taking over America! If you have ever played a boardgame with plastic/virtual pieces around, roll dice, conquer the lands of your enemy, & build new pieces to conquer with, you will be able to jump right into TripleA!

Tags: boardgame, Conquest, japan, java, Middle Earth, mod, Napoleon, open, roman empire, source, strategy, Tiberian Conquest, tiberian sun, triplea, TURN BASED, world war, ww2

GDevelop is a free, open-source game engine. Build from anywhere — even on your phone. Publish everywhere: iOS, Android, Steam, web, gaming platforms.

Tags: GAMEMAKER, Games, gdevelop, html5, open, source

Desktop and Mobile HTML5 Game Framework.

A fast, free and fun open source framework for Canvas and WebGL powered browser games

Tags: BROWSER, editor, GAMEMAKER, hmtl5, Mighty, open, phaser, source

Bad Cop is back. Command a small army of Combine synths and soldiers on a Northern campaign to capture Dr. Judith Mossman. A modification for Half-Life 2.

Tags: code, entropy, FPS, half-life, mod, open, source, zero

0 A.D. is a free, open-source, historical Real Time Strategy (RTS) game currently under development by Wildfire Games, a global group of volunteer game developers.

Tags: Age, ancient, empires, kings, LINUX, MAC, RTS, source

Mindustry is a hybrid tower-defense sandbox factory game. Create elaborate supply chains of conveyor belts to feed ammo into your turrets, produce materials to use for building, and defend your structures from waves of enemies. Features include a map editor, 24 built-in maps, cross-platform multiplayer and large-scale PvP unit battles.

Donationware, Open Source for Windows,MacOS,Linux and Android.

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Tags: defense, MAC, mindustry, open, source, tower

Solarus is a free and open-source Action-RPG game engine, licensed under GPL, and written in C++. It runs quests in Lua, and can work on a great number of platforms. Solarus also features a game editor called Solarus Quest Editor, written in C++ with Qt to help you create your game.

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Tags: engine, GAMEMAKER, LINUX, MAC, open, RPG, solarus, source, zelda

Terasology is a free and open-source survival and discovery game set in a voxel world. Influenced by Minecraft, Dwarf Fortress and Dungeon Keeper. Terasology requires Java 8 and an updated graphics card driver.

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Tags: java, LINUX, MAC, multiplayer, open, sandbox, source, terasology, voxel

Escape from a hostile computer system! Harvest data to create an armada of battle-processes to aid your escape! Take command directly and play the game as an RTS, or use the game’s built-in editor and compiler to write your own unit AI in a simplified version of C!

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Tags: A.I., circuit, code, GAMEMAKER, liberation, LINUX, rogue, RTS, sahmup, SIMULATOR, source

“The Open Sea” is a first real time strategy about the Golden Age of Piracy in the Caribbean sea, which is an open-source project. The settlement – the Atlantic Ocean. Note: the code browsing requires XNA Game Studio.

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Tags: caribbean, code, open, pirates, RPG, sea, source