OWL Web Ontology Language Overview
- Part of the OWL W3C specification. Introduction of vocabulary and examples.
- http://www.w3.org/TR/owl-features/

The Jorne Project
- An open-source project to create standards for combining RDF content and parseable Lojban text.
- http://jorne.org

Standard Upper Ontology Study Group
- IEEE Working Group standard specifying an upper ontology that should enable computers to utilize it for applications such as data interoperability, information search and retrieval, automated inferencing, and natural language processing.
- http://suo.ieee.org/

W3C Web-Ontology Working Group
- WebOnt Working Group is part of W3C Semantic Web Activity. Its objective is to develop a standard ontology language for the Semantic Web.
- http://www.w3.org/2001/sw/WebOnt/

OWL Web Ontology Language Guide
- OWL is a W3C Candidate Recommendation, designed to support ontologies distributed on the Web, using RDF.
- http://www.w3.org/TR/owl-guide/

Ontology Inference Layer (OIL)
- A proposal for a web-based representation and inference layer, using RDF Schemas.
- http://www.ontoknowledge.org/oil/

DAML+OIL
- The official page of the DAML+OIL specification, a precursor of the Ontology Web Language (OWL).
- http://www.daml.org/2001/03/daml+oil-index.html