From mind, in the mainstream, there were releases of Windows XP/Windows Server 2003-2008 R2, RedHat Enterprise Linux (https://www.redhat.com/en/about/press-releases/press-redhat72itanium - not sure if they exceeded 7.2), and FreeBSD (up-to 10, officially), and HP/Compaq NonStop, and OpenVMS (not sure about what the last release from VSI will be, before they finish migrating to x86-64), in terms of shipping products...
It could be interesting, to have a section on various operating systems, that were ported to the IA-64 ISA, somewhere...
Some of the more exotic ones, like Secure64 SourceT (https://www.networkworld.com/article/2296700/secure64-builds-dns-appliance-with-itanium-server.html), and SCO Monterey (which was folded into AIX for Itanium, according to http://ps-2.kev009.com/basil.holloway/ALL%20PDF/10072800.pdf), weren't well-documented, and I think that Bull (GCOS 8), or Fujitsu had some products, at some stage (Fujitsu at least, shipped a Primergy system). I also thought that Stratus VOS ran on Itanium, but it looks like it was only ever ported to x86.
From mind, in the mainstream, there were releases of Windows XP/Windows Server 2003-2008 R2, RedHat Enterprise Linux (https://www.redhat.com/en/about/press-releases/press-redhat72itanium - not sure if they exceeded 7.2), and FreeBSD (up-to 10, officially), and HP/Compaq NonStop, and OpenVMS (not sure about what the last release from VSI will be, before they finish migrating to x86-64), in terms of shipping products...
Any thoughts?