Suika3 is a C89-based 2D game scripting runtime with a declarative Visual Novel DSL. Targets iOS, Android, desktop, and consoles via a HAL/VM architecture with hybrid JIT/AOT compilation for x86, arm64, and RISC-V.

General purpose 3D and 2D game engine using Go (golang) and Vulkan with built in editor

eepp is an open source cross-platform game and application development framework heavily focused on the development of rich graphical user interfaces.

Using OpenGL, make the Game Engine or Renderer

This is a unity framework

ALPHA: OpenGL Game Engine built using Rust with SDK compiled for C/C#, Typescript, Python, Lua, Swift, Kotlin, C/C++, Go and Rust. Desktop / Web

A fast entity component system (ECS) for C & C++

3D game engine in plain C

Open Source cutting edge poor man's game framework. OpenXR, Vulkan single-pass renderer, ECS, artifact-free volumetric lights, advanced chaperone & locomotion etc. Gamedev Fundamentals in C++ & Vulkan.

A layered-based game framework

A C++23 framework for prototyping interactive GUI cross-platform desktop applications.

A game engine written for Windows using C++ and OpenGL 4.6.

The Nexis Game Engine. A Game Engine that aims to be Dynamic, Efficient and allow use through both pure code and a GUI/IDE, and the ability to switch between them anytime.

Bullfrog Hi-Octane C++ library

An Entity-Component-System framework for Java game servers

A modern, ECS based modular game engine framework built with C++23

A cross-platform framework for window creation, input handling, and rendering using OpenGL 4.5+

Corddown engine is a source code free and especially to Windows using directDX and more examples Mac fedora and Ubuntu!

High-performance, Composable framework for Fully On Chain Games and Autonomous Worlds

The STYNTHREAD Advanced Game Engine (SAGE) — born from defiance, built for consequence