SWI-Prolog
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SWI-Prolog offers a comprehensive Free Software Prolog environment, licensed under the Lesser GNU Public License.
Version
- SWI-Prolog 4.0.9 for OS/2 (2001-08-20) ported to IBM OS/2 Warp by Massimiliano Campagnoli
License
Open Source. Discontinued.
Kernel licensed under the LGPL. Prolog libraries are distributed under the GPL.