FreeProxy

From Hand-Crafted Software:

V3.5 is a significant upgrade to the product which allows many users to share an internet connection. The basic features includes proxying HTTP, SMTP, POP, FTP over HTTP, TCP Tunneling and now also SOCKS5. Works well with a wide range of clients including Browsers, ICQ and MSN messenger and comprehensive help illustrates the setup of these clients. In addition, FreeProxy includes authentication to both an internal user database or to a windows domain, extensive reporting, comprehensive control of resource permissions, URL filtering, IP address filtering, local port binding, demand dialing, calendar control, proxy chaining, includes a functional web server plus numerous other features. Will run as a service in all platforms from Win98, ME, 2000, XP, NT through to Server 2003. FreeProxy is professional freeware geared for volume usage but will still have you up and running in a matter of minutes. Free support available by email.