Squid is...

  • a full-featured WorldWideWeb proxy cache
  • designed to run on Unix systems
  • Free, OpenSource software
  • the result of many contributions by unpaid (and paid) volunteers

Squid supports...

  • proxying and caching of HTTP, FTP, and other URL's
  • proxying for SSL
  • cache hierarchies
  • ICP, HTCP, CARP, Cache Digests
  • transparent caching
  • WCCP (Squid v2.3 and above)
  • extensive access controls
  • filtering of undesired web content with ufdbGuard (fastest) or SquidGuard.
  • HTTP server acceleration
  • SNMP
  • caching of DNS lookups

See SquidNotes.