Amzi! Prolog + Logic Server :
- This extensible Prolog version runs under Windows, Linux, Solaris and HP/UX, supporting development of client and server applications embeddable in the web, C/C++, Java, Delphi, Visual Basic and other environments. An IDE is available for Windows along with an interpreter-based tutorial.
B-Prolog :
- Versatile and efficient CLP system based on Prolog with extensions for programming concurrency, constraints and interactive graphics. Runs on: Windows 9x/NT/2000/XP, Linux, Mac, Solaris, HP-UX, FreeBSD, SonyNews, Aix. Free evaluation version is available.
EZY Prolog :
- A typed prolog interpreter, compatible with Visual Prolog, powrefull syntax checker with flow pattern analyser, GUI designer for declarative GUI, built-in functionality for ODBC, Winsock, regular expressions, text parsing, XML processing, HTML formatted output of Prolog source. [Free for research purposes]