Open-source alternatives to Veloren

This project is a World of Warcraft server emulator that simulates a multiplayer online game world, managing player data and game logic. It functions as a modular game server framework and an NPC AI and scripting engine, providing the necessary infrastructure to host a persistent virtual environment. The system is distinguished by a modular framework that allows for the extension of core engine behavior through isolated modules and function hooks without modifying the source code. It includes a structured SQL data layer for managing authentication, character states, and world environment sett

ActionRoguelike is a third-person cooperative game project built with C++ and Unreal Engine. It functions as a networked application that utilizes replication architecture to synchronize character states and combat across multiple clients. The project implements a data-oriented performance framework that employs object pooling and asynchronous asset loading to optimize memory usage and frame rates. It features a behavior tree AI system combined with environment queries to drive autonomous NPC decision making and combat, alongside a binary serialization framework for saving actor variables and

This project is an open-source 3D game engine designed for building high-fidelity games, simulations, and cinematic environments. It functions as a robotics simulation platform with native integration for ROS 2 to model robot controllers and sensors. The engine features a multi-threaded Forward+ physically based renderer that supports hardware-accelerated ray tracing and global illumination. The system is built on a modular extension architecture using Gems to add or replace features without modifying core binaries. It includes a native SDK for AWS cloud integration, enabling IAM authenticati

Minetest is an open-source voxel game engine and platform used to create and share moddable 3D block-based games. It provides a framework for building interactive grid environments and generating custom voxel worlds. The project features a Lua-based modding framework that allows for the extension of game behavior and the addition of custom content without altering the core engine. This data-driven system supports a dedicated workflow for modifying game environments and logic. The engine supports multiplayer game hosting through a dedicated server architecture, enabling multiple players to co

This repository is a comprehensive collection of functional 2D and 3D demo projects and implementation samples for the Godot Game Engine. It serves as an interactive tutorial and reference library, providing a working codebase to demonstrate how to apply engine features in real-world scenarios. The collection focuses on practical implementation guides, covering a wide array of technical capabilities from basic engine fundamentals to advanced rendering and scripting techniques. It allows users to study the application of node-based composition, asset pipelines, and game logic through direct ex

Source Engine is a cross-platform game engine designed for the development and execution of interactive three-dimensional applications. It provides a framework for rendering complex environments and managing multiplayer networking, functioning as a middleware solution for hosting independent game servers. The engine distinguishes itself through a client-server authoritative networking model that enables direct player connectivity without reliance on external authentication or matchmaking services. It utilizes a data-driven asset pipeline and a component-based entity system to decouple engine

FXGL is a 2D game engine and development framework designed for Java and Kotlin. It provides a structured environment for building cross-platform desktop games, integrating a central game loop with an entity component system and a JavaFX-based scene graph for rendering. The toolkit distinguishes itself by providing a comprehensive suite of integrated libraries for game AI pathfinding, physics collision resolution, and multiplayer networking via TCP and UDP protocols. It includes specialized systems for adaptive user interface design using global stylesheets and a data-driven asset management

This project is a wave function collapse generator and voxel environment engine used for procedural world generation. It implements a constraint-based layout algorithm to resolve superpositions of modules into consistent 3D voxel grids. The system functions as a procedural city generator capable of creating infinite, walkable urban environments. It utilizes a dynamic dictionary to stream map data as a user approaches new areas, ensuring a continuous world without loading the entire layout at once. The engine manages layout consistency through adjacency rule definitions, boundary constraint e

minecraft-weekend is a voxel engine designed for rendering infinite three-dimensional environments. It utilizes procedural generation and mathematical noise functions to automate the creation of diverse landscapes, biomes, and height variations. The engine implements a voxel rendering system using buffer-based meshes and chunk-based world partitioning to manage GPU performance and memory usage. It includes a dynamic lighting system that calculates light values, transparency, and distance-based fog to simulate atmospheric depth. The project covers 3D game physics simulation through axis-align

Cubyz is a voxel game engine designed for building procedurally generated 3D sandbox worlds. It provides a framework for creating infinite landscapes with real-time terrain modification and exploration, supported by a dedicated voxel rendering engine. The project features a procedural terrain generator that utilizes a chunk-based system to allow for massive vertical construction without height or depth limitations. It optimizes performance through a distance-based rendering system that simplifies the geometric complexity of distant landscape elements to maintain wide view distances. The engi

Bareiron is a minimalist environment for hosting multiplayer game servers on low-power, memory-constrained devices. It functions as a Minecraft server optimizer designed to provide basic connectivity for remote players while operating on embedded hardware with limited system resources. The software includes a hardware performance tuner that allows for the disabling of intensive game mechanics and resource-heavy features to prevent system crashes. It also incorporates a network traffic controller to adjust broadcast frequencies and tick rates, reducing bandwidth consumption and lag. The syste

dprint is a multi-language code formatter that applies consistent styling across various programming languages using a pluggable architecture. It functions as a unified project style management tool, a command-line interface for continuous integration style enforcement, and a Language Server Protocol implementation for real-time formatting in editors. The project is distinguished by a WebAssembly-based plugin system that loads sandboxed formatting logic from URLs or file paths. It further extends its capabilities through a process-based tool integration that wraps external command-line interf

Agones is a Kubernetes game server orchestrator designed for hosting, scaling, and managing dedicated multiplayer game servers. It extends the Kubernetes control plane using custom resource definitions to define game server and fleet objects, utilizing a dedicated fleet manager to maintain pools of warm server instances. The system provides a game server SDK and language-specific client libraries that allow server processes to signal readiness, health, and shutdown states directly to the controller. It distinguishes itself through specialized scaling logic, including the use of WebAssembly mo

This project is a Python voxel game engine and real-time renderer designed for interacting with block-based 3D environments. It functions as a procedural terrain simulator and a first-person navigator, allowing users to explore and visualize worlds composed of individual cubes. The system enables direct procedural terrain manipulation, providing a mechanism to add or remove blocks in real time to create custom structures. It utilizes a first-person camera system to translate keyboard and mouse inputs into movement and perspective changes within the virtual space. The engine handles 3D space

This project is a game server management panel and multi-user administration tool. It provides a centralized web interface and orchestrator for deploying, configuring, and monitoring game servers running inside isolated Docker containers. The system manages the full lifecycle of server instances, from mapping network allocations and IP addresses to enforcing resource limits through containerization. It includes a hosting dashboard for handling server backups via local or cloud storage and a control plane for remote-agent communication with server nodes. Administrative capabilities cover role

Luanti is an open-source sandbox game engine designed for the creation and exploration of interactive three-dimensional voxel environments. It functions as a platform for building persistent digital spaces where users can modify block-based worlds and share custom content. The engine provides a framework for multiplayer interaction, utilizing a client-server architecture to synchronize world states across connected participants. It incorporates a scripting interface that allows for the integration of user-created modifications, alongside a centralized distribution system for managing and inst

Urho3D is a cross-platform 3D game engine written in C++. It uses a component-based scene graph to compose game objects from nodes and attached components, separating transforms from behaviors for modular design. The engine integrates AngelScript and Lua scripting for game logic, uses the Bullet library for physics simulation, and renders scenes with OpenGL or Direct3D through forward, deferred, or light pre-pass pipelines with customizable render passes and shadow mapping. The engine distinguishes itself with a built-in visual scene and UI editor for composing 3D worlds and interface layouts

This is the original C source code for the Quake game engine, a landmark first-person shooter engine from the 1990s. It is a retro game engine that renders 3D environments and processes player input in real time using CPU-based software rendering rather than GPU acceleration. The engine supports networked multiplayer gameplay over LAN or internet connections and is designed to be moddable, allowing users to create and run custom game modifications and levels. The engine's architecture includes a Binary Space Partition tree for efficient world geometry organization and visibility determination

Agones is a Kubernetes game server orchestrator designed for deploying, scaling, and managing dedicated multiplayer game server processes across a distributed cluster. It provides the core infrastructure needed to provision individual or grouped server processes to support real-time multiplayer gaming sessions. The system includes a fleet manager to automate the lifecycle of server groups based on player demand and a health monitor to track the connectivity and operational status of active processes. It integrates with cluster autoscalers to synchronize server resource requirements with cloud

Extism is a cross-language WebAssembly plugin framework that lets applications written in any programming language load and execute plugins written in any other language. It provides a universal plugin system where host applications use idiomatic SDKs to load WebAssembly modules, call exported functions, and pass data back and forth, while plugin authors use development kits that handle memory management and host interaction so they can focus on business logic. The framework distinguishes itself through its comprehensive approach to cross-language integration, offering schema-driven binding g

This project is a browser-based framework designed for building three-dimensional, block-based games and interactive simulations. It functions as a JavaScript library that provides the core infrastructure for rendering voxel environments, managing dynamic terrain data, and executing real-time physics within a web-based context. The engine distinguishes itself through a high-performance WebGL rendering pipeline that utilizes texture-atlas material mapping to consolidate visual assets and reduce draw calls. It manages large-scale environments by dividing the world into discrete, chunk-based spa

BrowserQuest is a WebSocket multiplayer game engine and real-time state synchronization tool. It functions as a web-based game server designed to manage concurrent connections and broadcast updates to maintain a consistent shared world state between a central server and distributed web clients. The project enables real-time multiplayer gaming and browser-based game development by implementing low-latency data exchange. It focuses on game state synchronization to ensure that multiple players interacting within the same environment see the same actions and world states simultaneously. The syst

Spring is a cross-platform game engine and framework designed specifically for the development and execution of multiplayer real-time strategy games. It provides a high-performance simulation environment for managing large-scale battles and unit movements across different operating systems using a shared codebase. The engine functions as a multiplayer game server and networking layer, coordinating real-time game state and match synchronization between remote players. It includes a dedicated lobby client system for multiplayer match coordination as well as the capability to execute single-play

vcmi is an open-source game engine for Heroes of Might and Magic III that recreates the gameplay, logic, and rendering of the original strategy game. It serves as a cross-platform game runtime supporting Windows, Linux, macOS, Android, and iOS, providing a turn-based strategy simulator for strategic world map navigation and tactical combat. The project is built as a moddable game framework, featuring a data-driven modding system and a sandboxed Lua scripting integration. These allow for the definition of custom gameplay logic, spell effects, and the addition of new factions, characters, and a

JoltPhysics is a high-performance C++ physics engine designed for multi-threaded simulation of 3D rigid bodies and soft bodies. It serves as a deterministic simulation framework, ensuring identical results across different platforms and architectures to support networked synchronization. The engine distinguishes itself through a focus on concurrent execution across multiple CPU cores to handle large numbers of active bodies. It provides specialized systems for vehicle physics, including wheeled and tracked models, as well as soft body physics for deformable objects and cloth. The simulation

LocalSend is a cross-platform utility designed for secure, peer-to-peer file transfers between devices on the same local network. By establishing direct, encrypted communication channels, the application enables users to share files without relying on external servers, cloud storage, or active internet connectivity. The project distinguishes itself through a unified codebase that supports native-looking interfaces across desktop and mobile operating systems. It utilizes automated peer discovery to identify available devices on a subnet and employs end-to-end encryption to ensure data integrit