Open-source alternatives to Micropolis

Quake III Arena is a first-person shooter game engine and arena combat simulator. It consists of the original C++ game source code for a cross-platform 3D game designed to run on Windows, Linux, and Mac. The project provides the source code necessary to render a first-person shooter experience, focusing on player-versus-player battles in closed 3D environments. It serves as a resource for legacy game preservation and the study of early 3D game engine construction. The engine incorporates spatial partitioning, client-side prediction, and state synchronization to manage multiplayer networking

Quake-2 is a game engine designed for the development of first-person shooters and the rendering of three-dimensional environments. It provides the core framework for processing real-time physics and player input within interactive 3D spaces. The engine supports software extensibility, allowing for the direct modification of source code to change gameplay mechanics and engine behaviors. This makes it a resource for retro game engineering and the study of early 3D development techniques. Its technical capabilities include vertex-based software rendering, BSP-tree spatial partitioning, and PVS

OpenTTD is an open-source game engine and transport simulation game. It provides an isometric sandbox environment for building and managing complex logistics and transport networks. The project functions as a multiplayer simulation sandbox where users can build infrastructure cooperatively or competitively in a shared virtual world. The platform is designed as a moddable simulation system that supports external assets, graphics, and gameplay modifications. It includes mechanisms for downloading and integrating add-on content and utilizes a plugin-based system to extend game mechanics beyond t

OpenRA is an open-source game engine designed for the development and modernization of real-time strategy titles. It provides a modular framework that allows developers to build standalone games or total conversion modifications by leveraging a trait-based entity composition system. The engine is built to support both the preservation of classic strategy games and the creation of new experiences, offering cross-platform compatibility and a flexible architecture for defining game rules and unit behaviors. The engine distinguishes itself through a configuration-driven approach where game logic,

Doom 3 GPL source release

This repository contains the C++ game source code for a single-player first-person shooter action game. It is a software implementation of the Id Tech 4 engine, designed for 3D rendering with a focus on real-time unified lighting and geometry. The project enables the modification of core engine logic and rendering systems. It serves as a resource for classic game engine modification, first-person shooter development, and retro game preservation. The engine utilizes a unified shader pipeline and stencil shadow volumes for lighting effects, alongside BSP tree spatial partitioning for visibilit

This repository contains the original source code for a classic real-time strategy game, serving as a legacy game engine implementation for managing units, maps, and combat mechanics in a military strategy setting. It functions as a real-time strategy game source code archive intended for preservation and technical study. The codebase acts as a game modification base, allowing developers to create custom content and modifications using the original source. It provides a foundation for retro game modding and software archeology to analyze how historical game mechanics were programmed. The pro

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Beyond-All-Reason is a real-time strategy game and 3D military simulation focused on large-scale tactical combat, base building, and resource management. It functions as a competitive multiplayer platform featuring ranked lobbies and skill-based matchmaking. The project includes a custom map editor for designing unique game levels and environments through structural and thematic configuration. The simulation covers military-industrial economy management, including resource extraction and asset recovery. Tactical gameplay involves commanding army formations, using radar for enemy unit detecti

This repository contains Swarm Assault remake project based on the OpenRA Mod SDK.

Descent 3 by Outrage Entertainment

Caesar III (Open source remake)

Aquaria open source, forked from icculus.org due to inactivity. Has many enhancements compared to the original version.

Shattered Paradise's main repository and installation Kit.

Star Wars Jedi Knight: Jedi Academy

Dungeon Crawl: Stone Soup official repository

GemRB is a portable open-source implementation of Bioware’s Infinity Engine.

Star Wars Jedi Knight II: Jedi Outcast

Official Hedgewars mirror for GitHub!

An underwater one-button real-time strategy game.

A KKnD and KKnD2 mod on OpenRA engine.

Rogue Legacy Source Code

CorsixTH is an open-source game clone and hospital management simulation game. It functions as a reproduction of a classic management title where players coordinate staff and treat patients to manage a medical facility. The project includes a level editor tool for designing original maps and campaigns. It also features a customizable input system that allows users to map game hotkeys and personalize control schemes. The simulation supports game localization to translate interface text and dialogue into multiple languages.

Strategy game based on history, mythology and fiction

A Pikmin-based game/engine for fan-made content.

Open source release of Canabalt for iOS