fact++ - 1.6.5~dfsg-3+b1 main

FaCT++ is a DL reasoner.
It supports OWL DL
as well as the forthcoming standard OWL 1.1.
FaCT++ is implemented in C++
and uses optimised tableaux algorithms.
The tool is probably best known
for its compatibility with the tool Protege
that helps to formally represent semantics.