1743 Open source projects that are alternatives of or similar to Freeorion

ET: Legacy is an open source project based on the code of Wolfenstein: Enemy Territory which was released in 2010 under the terms of the GPLv3 license.

3D multi-player tank battle game

Compatible client of Ace of Spades 0.75

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Multiplayer, fast-paced Moba style game

Free (as in freedom) open source clone of the Age of Empires II engine 🚀

Launch your LASERCRAB at walls, ceilings, and enemy heads in this indie multiplayer shooter where "move" and "attack" are synonymous.

A retro multiplayer shooter

BetterSpades, an Ace of Spades client targeted at low end systems (GL/ES 1.1). Runs on your grandmother's rig!

Ore Infinium, Open Source multiplayer Terraria-inspired Sci-fi game, focused on technology, devices and researching. Written in Kotlin (JVM), LibGDX. Cross platform

A simple Minecraft clone written in C using modern OpenGL (shaders).

Open "Minecraft-like" game with multiplayer support and Lua scripting support for the both client and server

Multiplayer First-Person Shooter written in C++ using my own engine, Qor

Soldat is a unique 2D (side-view) multiplayer action game

🚗 🏎️ 🎮 online 3D multiplayer neural networks based racing game

Plugin-based client-server voxel game engine written in D language

The Advanced Prince of Persia Engine (a childhood dream)

SpatialOS GDK for Unity FPS Starter Project

Develop iOS Android app in java, Cross platform java virtual machine , the minimal jvm .

Reldens - You can make it - Open Source MMORPG Platform

UNMAINTAINED: Please have a look at the entity-system

The Open-Source IO Shooter is an open-source multiplayer game in the browser

A cross platform 2D game engine written in C++ for beginners

A portable, enhanced source port of Doom, Heretic and Hexen.

A Minecraft like game written in go

A Doom Renderer written in Rust.

Third-person Survival Game for Unreal Engine 4 (Sample Project)

A fan-made multiplayer Super Mario Bros. style deathmatch game

Networking framework for Entitas ECS. Targeted at turnbased games or other slow-paced genres.

OpenMMO - Groundwork

An open world adventure and dungeon crawling game

An Open-Source port of the 1999 Game "Star Wars Episode 1: Racer"

Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. A 100% free and open source real-time strategy game for Windows, macOS, Linux, BSD+

TOAST Haste framework is a pure java implementation of asynchronous game server framework

A 2d game that aspires to be similar to Rimworld, with more depth, magic, and RPG concepts.

A remake of the popular battle royale game, Fortnite, made in Unreal Engine 4 and integrated with Amazon GameLift

C++ Coop Horde Third-person Shooter for Unreal Engine 4 (Udemy Project)

a Cross-Platform, 2D Survival Sandbox Game Project. Based on C++17/cmake/OpenGL/SQLite3.

An open-source 2D HTML5 adventure based off BrowserQuest (BQ).

A real-time physically based rendering engine written in C++ and OpenGL

Dust Racing 2D is a traditional top-down car racing game including a level editor.

Multiplayer, interactive, realtime typing speed game

SpatialOS GDK for Unity

"KaM Remake" is an RTS game remake written in Delphi from scratch.

🎮 Open Source teleportation based first person puzzle-platformer

The main repository containing Stunt Rally sources and game data. A 3D racing game based on VDrift and OGRE with track editor.

Data interchange and engine re-implementation for games by Retro Studios | Mirror

A basic cross-platform 3D game engine

Functional Reactive Programming domain-specific language embedded in Haskell, for programming efficient hybrid (mixed discrete-time and continuous-time) systems.

Collection of cross-platform one-file C/C++ libraries with no dependencies, primarily used for games

A re-implementation of Freelancer

Open source bridge simulator. Build with the SeriousProton engine.

Turn based tactical RPG with several campaigns, written in Rust

Darkest Dungeon port in Unity. Almost completely identical to the original. Platforms: PC/Android.

A C99 3D game engine

Lightweight and modular C++11 graphics middleware for games and data visualization

Desktop/Android/HTML5/iOS Java game development framework

A modern re-implementation of the classic DOS game Duke Nukem II

🍎👩‍🏫 Collection of Demos for THREE.js in Expo!

A free and open-source Touhou Project fangame