Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
...A fully custom network appliance operating system built from scratch over 20 years, now fully open source.
One ISO includes: firewall, VPN, web antivirus, URL filtering, SSL inspection, WAF, reverse proxy, load balancer and QoS.
Free for any number of users. Optional paid support available.
Source code: https://github.com/cacheguard/CacheGuard-OS
Website: https://www.cacheguard.com/
NetCop is UTM, UTM Firewall, ClamAV Antivirus, Web Cache, Content Filter,IPS/IDS, WAN Link Manager, Bandwidth Manager, Anonymous Proxy Blocker, Wifi Hotspot Controller, SSL VPN, Network Virtulization in single ISO CD distribution.
...Archangel uses the pyicap library to implement the ICAP functionality. The blockpage requires use of the PHP 5.4.x CLI. In order to do HTTPS filtering, you must first install squid compiled with SSL support and configure it to talk to archangel.