How to: Web Servers
* [Agoo](https://github.com/ohler55/agoo) - A high performance HTTP server for Ruby that includes GraphQL and WebSocket support.
* [Falcon](https://github.com/socketry/falcon) - A high-performance web server for Ruby, supporting HTTP/1, HTTP/2 and TLS.
* [Iodine](https://github.com/boazsegev/iodine) - An non-blocking HTTP and Websocket web server optimized for Linux/BDS/macOS and Ruby MRI.
* [Phusion Passenger](https://www.phusionpassenger.com) - Fast and robust web server and application server.
* [Puma](https://github.com/puma/puma) - A modern, concurrent web server for Ruby.
* [Rack](http://rack.github.io) - A common Ruby web server interface. By itself, it's just a specification and utility library, but all Ruby web servers implement this interface.
* [Thin](https://github.com/macournoyer/thin) - Tiny, fast & funny HTTP server.
* [TorqueBox](https://github.com/torquebox/torquebox) - A Ruby application server built on JBoss AS7 and JRuby.
* [Unicorn](http://unicorn.bogomips.org) - Rack HTTP server for fast clients and Unix.