This page contains the most relevant and useful libraries and tools that we've released as open source. Although we don't guarantee free support for these projects, you should feel free to contacts us anyway with any questions or feedback!
With H/OS release 2.2, the SPG/VSP appliances gained DKIM (RFC4871) signing and validation functions, based upon our libdkim++ project. It was developed in C++, as opposed to Sendmail's dkim-milter project written in C. It's a lightweight and portable library for *NIX, supporting both signing and SDID/ADSP verification. As of it's extensive unit test coverage, we aim at being fully compliant with the current RFC.
Security router (SR)
Halon Security's security router (SR) is a firewall/router software distribution based on OpenBSD. The great majority of the system is open source; after downloading, it may be browsed by logging in as root.
Spam prevention (SP)
This virtual machine e-mail security gateway can be used free of charge for non-commercial use. You'll get the commercial anti-spam and anti-virus for 30 days, in order for you to experience enterprise-grade protection with virtually no false positives.
A simple, portable tool for measuring SMTP server delay, delay variation and throughput. It measures the delay in 1/100th of a millisecond for each step in a SMTP transaction, summarised with min/avg/max. It behaves very much like your regular ping utility and comes with sources and a win32 executable.