SB-Prolog
Stony Brook Prolog. A public domain Prolog interpreter for Unix. Version 3.1. Distributed under the GNU General Public License.
ftp://sbcs.sunysb.edu/pub/sbprolog/.
Amiga version 2.3.2 and ftp://ftp.cso.uiuc.edu/amiga/fish/f1/ff141.
Stony Brook Prolog. A public domain Prolog interpreter for Unix. Version 3.1. Distributed under the GNU General Public License.
ftp://sbcs.sunysb.edu/pub/sbprolog/.
Amiga version 2.3.2 and ftp://ftp.cso.uiuc.edu/amiga/fish/f1/ff141.