Open-source alternatives to Screen 13

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

A set of utilities for taking the pain out of Vulkan in header only modern C++

HTML5 entity-component game engine

C++ Bitmap Library https://www.partow.net/programming/bitmap/index.html

A very lightweight wrapper around Vulkan

The Atomic Game Engine is a multi-platform 2D and 3D engine with a consistent API in C++, C#, JavaScript, and TypeScript

Axmol Engine – A Multi-platform Engine for Desktop, XBOX (UWP), WebAssembly and Mobile games. (a fork of Cocos2d-x-4.0)

Babylon.js is a JavaScript game engine and real-time graphics renderer designed for creating interactive three-dimensional visuals and applications. It functions as a web-based 3D framework and WebGL engine that enables the deployment of high-performance 3D content across various web platforms and devices. The project provides tools for web-based 3D game development, real-time graphics rendering, and the creation of browser-based interactive visualizations. It also supports the development of WebXR virtual and augmented reality experiences using standard web technologies. The framework cover

Ambient is a cross-platform multiplayer game engine and runtime environment developed in Rust. It provides a system for building and deploying high-performance games that run across web browsers and desktop platforms using WebAssembly and WebGPU. The project features a networked database that automatically replicates real-time state and components between servers and players. It utilizes WebAssembly sandboxes to isolate game logic, which prevents individual script crashes and allows for the secure execution of untrusted code. The framework includes a graphics system for high-fidelity 3D visu

Tiled is a visual editor for creating two-dimensional game environments, functioning as a tile map editor and game level design tool. It allows for the construction of game worlds by arranging reusable tile sets and assets into maps. The system includes a tile set manager to organize and modify collections of tiles that can be shared across multiple project maps. It supports the creation of complex environments through layered map composition and the placement of objects at precise coordinates. The editor provides capabilities for grid alignment, coordinate-based layouts, and the attachment

bgfx is a cross-platform, graphics rendering abstraction layer designed for high-performance applications. It provides a unified interface that maps high-level rendering commands to native graphics APIs, allowing developers to maintain a single codebase that executes consistently across diverse operating systems and hardware architectures. The library distinguishes itself through a multi-threaded command submission model that decouples rendering logic from the main application thread, effectively minimizing CPU bottlenecks. It utilizes a backend-agnostic command buffer and a deferred resource

Classic point and click adventure game engine and editor

2D Vector Graphics Engine Powered by a JIT Compiler

Isometric game engine. Open world, block/voxel based and sprite rendering.

An open source, cross-platform game engine designed for indie developers.

This repository was moved to GitLab: https://gitlab.com/solarus-games/solarus

Cinder is a C++ creative coding library and native graphics toolkit designed for developing professional interactive media and visual art. It serves as a cross-platform multimedia framework for generating high-performance generative digital art and real-time visual rendering. The framework provides a professional suite of tools for building hardware-integrated installations and cinematic visuals. It focuses on real-time graphics programming and the production of high-quality graphics for professional displays. The library includes a cross-platform abstraction layer and a modular architecture

A free and open 3D game engine written in D.

Free/Libre Action Roleplaying Engine (engine only)

Game engine for making 2d games on iOS, macOS and tvOS, with practical examples and tutorials

Cocos2d for Web Browsers. Built using JavaScript.

Akihabara framework