| Stable release | 6.2.0 / 2010.10.28 |
|---|---|
| Operating system | Linux, Windows, Solaris, Mac OS X |
| Platform | Programming language |
| License | Perl Artistic License 2.0 |
| Website | http://www.dcc.fc.up.pt/~vsc/Yap/ |
YAP is an open source, high-performance implementation of the Prolog programming language developed at LIACC/Universidade do Porto and at COPPE Sistemas/UFRJ. Its Prolog engine is based in the WAM (Warren Abstract Machine), with several optimizations for better performance. YAP follows the Edinburgh tradition, and is largely compatible with the ISO-Prolog standard and with Quintus and SICStus Prolog. YAP has been developed since 1985. The original version was written in assembly, C and Prolog, and achieved high performance on m68k-based machines.