Some of the most widely used web server frameworks in Rust were:

1. **Actix**: Actix is a powerful and popular asynchronous web framework in Rust. It is designed for building highly concurrent and scalable applications. Actix provides support for features such as middleware, routing, request handling, and WebSocket communication.

2. **Rocket**: Rocket is a web framework that aims to make web development in Rust both simple and fast. It emphasizes ease of use and comes with a variety of features like request routing, templating, and static file serving.

3. **Warp**: Warp is another asynchronous web framework for Rust that is known for its high performance. It leverages Rust's async/await feature to handle concurrent requests efficiently. Warp focuses on providing a composable and expressive API for building web applications.

4. **Tide**: Tide is a minimalistic and expressive web framework that is built on top of the async-std runtime. It aims to provide a flexible and ergonomic API for building web applications in Rust.

5. **Hyper**: Hyper is not a full-fledged web framework but rather a low-level HTTP library for Rust. It is widely used in combination with other libraries or frameworks to handle low-level HTTP communication.

6. **Gotham**: Gotham is a flexible web framework that is designed with performance and modularity in mind. It provides a range of features such as routing, middleware, and extensible request/response handling.

For the most up-to-date information, I recommend checking the Rust community forums, repositories on GitHub, or the official Rust website.
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