No, there is not a Solaris x86 version of the Interlink Networks, LLC RAD-Series RADIUS server. The RAD-Series RADIUS Server is available for the Solaris OS running on the SPARC architecture and the Linux OS running on the Intel x86 architecture.
Currently, there are no plans to develop a Solaris x86 version. It is not on the roadmap.
If you would like to make a case for a Solaris x86 version, please submit a feature request.