TACACS and Radius Recommendations

Hi Folks,

Looking for recommendations for a TACACS and/or Radius product that meets the following requirements:

• Installs on Windows (not Server, I know..)
• Relatively easy to manage
• Preferably Free/Cheap

Reason for the above is that we do not want to stand up a dedicated Linux Box for these requirements if we can help it, as if I would be, I'd use TAC_Plus. I would also prefer to keep my Radius separate from my current other accounts/LDAP/AD. Otherwise open to suggestions.

Thanks