Bevy

Bevy is a free, open-source game engine written in Rust for building 2D and 3D games. It is a code-first engine with no visual editor: you define your game in Rust using a data-oriented architecture built on the Entity Component System (ECS) pattern, which lets app logic run in parallel across CPU cores when possible.

Bevy is modular, so you pull in only the parts you need through Cargo features and replace the ones you don't. It targets a complete 2D and 3D feature set, and a fast-compile setup keeps iteration quick. The engine is still in early development, and a release with breaking API changes ships roughly once every three months, with migration guides for each.

Bevy is permissively dual-licensed under MIT and Apache 2.0, so you can pick either license. It is built and maintained as a community project, and runnable official examples ship with the source for learning specific concepts.