Squid is a high-performance caching proxy server for web clients. It supports FTP, gopher, and HTTP protocols.
Squid servers can operate in a hierarchical fashion.
A server can have any number of parents or siblings. Squid is available in source form under the GNU Public License. It can be built on most modern Unix operating systems that have an ANSI C compiler. Caching proxy servers improve performance for end users' web browsers, and reduce bandwidth utilization. A receive-only list for announcements of new versions.