SSSW OWL Examples contains OWL reasoning examples, including OWL ontologies and explanations as to what inferences can be made. This is a good source of OWL statements and what they can mean to a reasoner.
Bossam Rule/OWL Reasoner is another Java based rule engine. It includes a set of rules for OWL reasoning, uses the RETE algorithm, and can be embedded in Java systems. It can reason with Java objects as well as simple facts. Bossam also supports SWRL.
OWL Rules in JESS includes Jess rulebase based on OWL Semantics. This implements a lot (how much?) of OWL inside JESS.
> This page contains source code and instructions to load OWL ontologies and annotations into a JESS knowledge base
OWLIM is a high-performance semantic repository, packaged as a Storage and Inference Layer (SAIL) for the Sesame RDF database. OWLIM uses the IRRE engine to perform OWL DLP reasoning. The reasoning and query evaluation are performed in-memory, while a reliable persistence strategy assures data preservation, consistency and integrity.
– From the OWLIM Page.