jWAM
A 100% Java Warren Abstract Machine implementation.
...I have done some comparison's with other Java based Prolog engine's and jWAM does seem to outperform them all quite well (tuProlog, JLog, JIP, jTrolog). However, if you need a Java based Prolog engine for your project I recommend tuProlog and jTrolog as they are at the moment way more mature than jWAM.
Most notable to-do's:
- Built-in predicates.
- Debugging tools.
- Testing.
- Documentation and commenting.
- Android port. (I have the engine working with a test app but I still need to build a proper app)...