Free Software for Rust
Actix.rs
A powerful, pragmatic, and extremely fast web framework for Rust. With Actix.rs you can forget about stringly typed objects, from request to response, everything has types. Actix provides a lot of features out of box. HTTP/2, logging, etc and is easily extensible. Allowing you to create your own libraries that any Actix application can use.
Bevy Engine
Bevy is a refreshingly simple data-driven game engine built in Rust. In Bevy, all engine and game logic uses Bevy ECS, a custom Entity Component System, the fastest ECS according to some benchmarks. With Bevy you can create and render 2D using sprite sheets, dynamic texture atlases, cameras, textures, and materials and extend the capability of the engine with custom shaders, materials, and render pipelines. It also allows you to create 3D games with a modern and flexible 3D renderer with lights, cameras, meshes, textures, materials, gltf loading custom shaders, materials, and render pipelines. The game engine is developed and released as open source software under the MIT License.