- [Apache HTTP Server](http://httpd.apache.org/) - Secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. ([Source Code](https://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/))
- [Caddy](https://caddyserver.com/) - Powerful, enterprise-ready, open source web server with automatic HTTPS. ([Source Code](https://github.com/caddyserver/caddy))
- [Cherokee](http://cherokee-project.com/) - Innovative, feature rich, lightning fast and easy to configure open source web server designed for the next generation of highly concurrent secured web applications. ([Source Code](https://github.com/cherokee/webserver/))
- [HAProxy](http://www.haproxy.org/) - Very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
- [Hiawatha](https://www.hiawatha-webserver.org/) - An advanced and secure webserver for Unix. ([Source Code](https://gitlab.com/hsleisink/hiawatha))
- [Lighttpd](http://www.lighttpd.net/) - Secure, fast, compliant, and very flexible web server that has been optimized for high-performance environments.
- [Nginx](https://nginx.org/en/) - HTTP and reverse proxy server, mail proxy server, and generic TCP/UDP proxy server. ([Source Code](https://hg.nginx.org/nginx/file/tip))
*Web Performance.*
- [HAProxy](http://www.haproxy.org/) - Very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
- [Traefik](https://traefik.io/) - HTTP reverse proxy and load balancer that makes deploying microservices easy.
- [Varnish](https://www.varnish-cache.org/) - Web application accelerator/caching HTTP reverse proxy.