Yes, there are some alternatives to Nginx written in Rust. Here are a few examples:

1. Trillium: Trillium is a lightweight web framework and HTTP server written in Rust that focuses on simplicity, ease-of-use, and performance. It's designed to be flexible and modular, and it supports middleware for handling common tasks like routing, serving static files, and logging.

2. Actix-web: Actix-web is a high-performance web framework for Rust that's designed for building large-scale, data-driven web applications. It uses a powerful actor model to handle requests and responses, and it supports both synchronous and asynchronous programming models.

3. Rocket: Rocket is a web framework for Rust that emphasizes simplicity, ease-of-use, and security. It provides a simple and intuitive API for building web applications, and it includes built-in support for templating, database access, and authentication.

All of these alternatives are actively maintained and have growing communities.
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