Jay is a collection of Jai modules that together form a game engine.
The most complete modules right now are: Jay_Math - A faster, feature-rich version of the default Math module. Its main downside is that it currently only supports x86 platforms. PRs are welcome.
Jay_ECS - An experimental compile-time-ish ECS. It is not under active development until the renderer is closer to completion.
Jay_Core - The main engine module. It is a thin layer of glue that holds everything together.