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.
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.
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 versatile game engine designed for creating 3D games and experiences. It includes landscape sculpting, a physics engine, customizable shaders, and procedural foliage generation.
Comfy is a fun 2D game engine built in Rust. It's designed to be opinionated, productive, and easy to use. Inspired by macroquad, raylib, Love2D and many others, it is designed to just work and fill most of the common use cases.
A Zig game engine & graphics toolkit, for building high-performance, truly cross-platform, robust & modular games, visualizations, and desktop/mobile GUI apps
Oxygengine is an all-batteries-included kind of engine, focused on being Web-first but slowly moving more into more platforms such as desktops and consoles