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| | Free Prolog Compilers and Interpreters (thefreecountry.com) |
 | | Ciao Prolog is a GNU GPL Prolog system that supports ISO Prolog as well as various extensions, such as programming with functions, objects, threads, etc. It comes with libraries that support WWW programming, sockets, interfaces to other languages (eg C, Java, TclTk, relational databases), etc. The compiler allows you to generate architecture-independent and standalone executables. |
 | | From their website: Kernel Prolog is "a lightweight Java based Prolog interpreter with an innovative system of built-ins based on Fluents, a Prolog extension providing reflection and smooth interoperation with external objects." It is released under the GNU GPL, so source code is available. |
 | | This Prolog compiler complies with the ISO standard for Prolog (with useful extensions like global variables, ability to interface with the operating system, etc) and produces a native binary that can be run standalone. |
| www.thefreecountry.com /compilers/prolog.shtml (995 words) |
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