Get the latest stable release 4.1.0.08BF, containing Selective SSL Filtering (automatic exclusion from HTTPS decryption) for Government and Financial sites, released on March 31, 2015.
Next version of Web Safety supports better reporting and more Squid management capabilities.
Current version of Web Safety for Squid proxy supports FreeBSD and pfSense 2.1.5. Default Squid package that comes with this OS does not include ICAP module so you would need to install Squid from ports.
Web Safety for Squid Proxy supports native installation on most well-known Linux distributions, including RedHat, CentOS, Raspberry PI, Debian and Ubuntu.