Suggestions about captive portal

[Giuseppina Venezia]

Hi all,
I would like to know what Captive Portal you advise to use and in
particular what supports better Freeradius.
For the moment I'am using Chillispot.
My problem is always the same:
set the NAS to accept the IP address, assigned by IP pool, from FreeRADIUS.
I have searched documentation related to my NAS (Doc, forum, mailing
list, ecc.ecc.) but I haven't find nothing of useful for my problem.
Fort this reason i would to use another captive portal (that support
freeradius) that can solve my problem.
Thanks in advance for every advice or help.

Best regards.
Giusy