Reverse proxy

Apache HTTP Server
The Apache HTTP Server, commonly referred to as Apache, is web server software notable for playing a key role in the initial growth of the World Wide Web.

DeleGate (networking)
DeleGate is a lightweight proxy server.

nginx
nginx is an open source Web server and a reverse proxy server for HTTP, SMTP, POP3 and IMAP protocols, with a strong focus on high concurrency, performance and low memory usage.

Perlbal
Perlbal is a Perl-based reverse proxy load balancer and web server.

Pound (networking)
Pound is a lightweight open source reverse proxy program suitable to be used as a web server load balancing solution.

Reverse proxy
In computer networks, a reverse proxy is a type of proxy server that retrieves resources on behalf of a client from one or more servers.

Squid (software)
Squid is a proxy server and web cache daemon.

Tinyproxy
Tinyproxy is a HTTP proxy server daemon for POSIX operating systems.

Traffic Server
The Apache Traffic Server (TS) is a modular, high-performance reverse proxy and forward proxy server, generally comparable to Nginx and Squid.

Varnish (software)
Varnish is an HTTP accelerator designed for content-heavy dynamic web sites.

WinGate
WinGate is Integrated Gateway Management Software for Microsoft Windows, providing web caching, firewall and NAT services, along with a number of integrated proxy servers and also email services...