Bioshader simulation runs in browser or natively on windows, macos or linux on the GPU for massive parallelism
Bioshader runs almost entirely on the GPU, so it's possible to run hundreds of thousands of entities at a decent frame rate if you have a graphics card but small worlds will run fine on pretty much any mac/linux/windows computer. It's built with bevy, rust, and slang. It's got enough features to evolve pathfinding (vision with occlusion, neural nets, mutations, metabolism and asexual reproduction with mutation). Tons of stuff can be configured with sliders and worlds can be saved and reloaded. There are tools for painting terrain and plants. More features to come. So far I've focused on the scaling and gpu compute pieces.
Edit: The native binaries will run on most windows/linux/mac computers. The browser version requires Webgpu which is pretty bleeding edge and highly variable across browsers. I've seen the browser version work on Chrome/Safari/Edge. I have not tested on Firefox or Opera. It probably will not run on anything other than Chrome, Safari or Edge.