Squid

Squid is a fully-featured HTTP/1.0 proxy which is almost (but not quite - we're getting there!) HTTP/1.1 compliant. Squid offers a rich access control, authorization and logging environment to develop web proxy and content serving applications.

Squid is based on the Harvest Cache Daemon developed in the early 1990's. It was one of two forks from the codebase after the Harvest project ran to completion. (The other fork being what became Netapp's Netcache.)

The Squid project was funded by an NFS grant which covered research into caching technologies. The ircache funding ran out a few years later and the Squid project continued through volunteer donations and the occasional commercial investment.

Squid is currently being developed by a handful of individuals donating their time and effort to building current and next generation content caching and delivery technologies. An ever-growing number of companies use Squid to save on their internet web traffic, improve performance, deliver faster browsing to their end-clients and provide static, dymanic and streaming content to millions of internet users worldwide

Features:
- proxying and caching of HTTP, FTP, and other URLs
- proxying for SSL
- cache hierarchies
- ICP, HTCP, CARP, Cache Digests
- transparent caching
- WCCP (Squid v2.3 and above)
- extensive access controls
- HTTP server acceleration
- SNMP
- caching of DNS lookups