FTEQW is an advanced and portable Quake engine. It supports multiple games running on idTech, plus its own set of games that developers have created.

Range Engine an open source engine that runs as a modified version of Blender

Hot Soup Processor is an interpreter used for developing 2d and 3d games, starting development since NEC PC88 times

A powerful, C++ engine, built on literal decades of proven torque technology

Indigo is a game engine written in Scala for functional programmers, allowing game developers to build games using a set of purely functional APIs that are focused on productivity and testing

A Rust library to create Good Games Easily

Narrat is a beginner-friendly game engine for making narrative games with RPG features, visual novels, interactive fiction, and more

Luna is a visual novel engine made using JavaScript.

RPG Architect is a next-generation RPG game maker with all of the limitations removed. It is designed to be simple enough for a newcomer and advanced enough for a veteran of game making engines.

Modern Multiplatform Game Engine for Kotlin

Intersect provides a complete game development suite for creating 2d mmorpgs with no programming experience

KAPLAY is a JavaScript and TypeScript game library that makes it easy to create games for the web. It's free, open-source and fun.

The 8th Wall Studio Game Engine is a powerful, browser-based development environment designed to build cross-platform 3D & spatial (XR) games directly on the web.

A development kit for Nintendo Entertainment System that designed with ease of use in mind, it has every tool you need to make your game from asset converters to a map editor, and uses C as its programming language.

Jo Engine is an open source 2D and 3D game engine for the Sega Saturn written in C under MIT license. It allows to develop game easily without extensive knowledge in embedded development.

A cross-platform framework aimed at (but not limited to) real-time applications requiring audio, 2D and 3D real-time rendering, network and more.

Cross platform Vulkan/OpenGL 3D engine for personal experimentation

anitya is offers a low-code software toolkit designed to empower creators brands to effortlessly develop immersive 3D experiences, including gamified training modules, collaborative workshops, and e-commerce solutions.

A beginner-friendly Game Engine that is packaged with everything you need to create games, no programming or modelling knowledge required

An easy-to-use Game Engine in FreeBASIC, for amateurs, hobbyists, enthusiasts who make game projects for entertainment, in their free time from work or study

This is a cross platform toy engine that is available on Linux, Windows and MacOS.

A free, open source game engine written in C++ that's modular and flexible, such that it can be adapted to many different use cases.

Modd.io is a low-code game engine where you can play & make games all in a browser with built-in netcode and free server hosting

an open-source 3d game engine written in C++, it has powered several successful commercial titles across various platforms including Steam, PSN, iOS, and the Mac Store.

A game development platform built in C#

A versatile game engine designed for creating 3D games and experiences. It includes landscape sculpting, a physics engine, customizable shaders, and procedural foliage generation.

A no-code game maker that runs right in your browser. Flowlab makes it easy to get started making your own games. Publish your creations as iOS or Android mobile apps, or export for PC & Mac.

A free and open-source cross-platform library for the development of multimedia applications like video games using Python

An extendible WebGPU game and simulation engine for fun, games and research.

Pragma is a free, open source custom game engine written in C++