Good Free Prolog implementation

From: Nicola Di Mauro (ndm_at_di.uniba.it)
Date: 12/03/04


Date: Fri, 03 Dec 2004 15:27:30 +0100

Dear all,
I am looking for a good Free Prolog implementation to port a system.
What I need is efficiency. I am thinking to XSB.
What do you think about?

Thank you,
Nico