Ontology - Descriptive and Formal
Resource guide for contemporary ontology: includes essays and bibliographies; provides a look at the theory's past and evolution ...
www.formalontology.it/   reviews

What is an Ontology
Article by Tom Gruber. Short answer: An ontology is a specification of a conceptualization.
www-ksl.stanford.edu/kst/what-is-an-ontology.html   reviews

KBS/Ontology Projects Worldwide
www.cs.utexas.edu/users/mfkb/related.html   reviews

Achille C. Varzi - Home Page
Achille C. Varzi Associate Professor of Philosophy at Columbia University, New York (USA). A graduate of the University of Trento (Italy), he received his M.A. and Ph.D. degrees in philosophy from the University of Toronto (Canada). His main research interests are in logic and metaphysics. Work in progress includes a book on identity and a volume of illustrated philosophical stories for children.
www.columbia.edu/~av72/   reviews

Buffalo Ontology Site
ontology.buffalo.edu/   reviews

The Identity of Indiscernibles
Stanford Encyclopedia of Philosophy A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z The Identity of Indiscernibles The Identity of Indiscernibles is a principle of analytic ontology first explicitly formulated by Wilhelm Gottfried Leibniz in his Discourse on Metaphysics, Section 9 (Loemker 1969: 308). It states that no two distinct substances ...
plato.stanford.edu/entries/identity-indiscernible/   reviews

Tropes
Stanford Encyclopedia of Philosophy A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z Tropes A trope is an instance or bit (not an exemplification) of a property or a relation; e.g. Clintons eloquence, Sydneys beauty, or Pierres love of Helo se. Clintons eloquence is understood here not as Clintons participating in the universal eloquence, nor ...
plato.stanford.edu/entries/tropes/   reviews

Holes
Stanford Encyclopedia of Philosophy A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z Holes Holes are an interesting case-study for ontologists and epistemologists. Naive, untutored descriptions of the world and explanations of facts in the world often make essential reference to holes. A hole explains why water flowed out of the reservoir. A ...
plato.stanford.edu/entries/holes/   reviews