A Prolog interpreter, written in Java, that is well suited for educational purposes. It works as both an application and as an applet.

Java implementation of Prolog plus the Conceptual Graphs of John Sowa. Object oriented extensions also included. [Open source, LGPL]

A fast multi-threaded, networking and GUI enabled Prolog compiler, extensible through a Reflection based Java interface.

Implementation of ISO Prolog in 100% Java. Extensible with any Java class. Callable as servlet, applet, standalone, or Java class library. Includes XML parser and generator. [Commercial]

Java Internet Prolog is a Prolog Java-compatible interpreter. JDK1.1- and Edinburgh Prolog-compliant this Prolog version allows code written in Prolog to be run in any Java applet or application and Java methods to be called in any Prolog code.

Experimental Prolog to Java compiler, running on JDK 1.0.2 and higher.

A Java-based light-weight Prolog for Internet applications and infrastructures, developed at DEIS - Universitá di Bologna. Released under GNU Library or Lesser General Public License.

Experimental Prolog interpreter in Java, mixing Logic and OO paradigms.