... types of games. It should be beginner friendly but also allow more advanced uses such as custom render passes and GLSL shaders. Thanks to the Rust programming language, Amethyst uses all CPU cores to run its internals and logic. A lot of optimizations have yet to be done, but the current status is already showing great potential. Amethyst is open source and free software. You can use, read, modify, distribute its source code under the permissive MIT and Apache 2.0 licenses.