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.