Gist is Semantic Arts’ minimalist upper ontology for the enterprise. Gist is designed to provide the maximum coverage of typical business concepts with the fewest number of primitives and the least amount of ambiguity.
The gist ontology is free (distributed under the Creative Commons 3.0 Attribution-ShareAlike license) which may disguise how valuable it is to have as a sound foundation.
Too many ontologies have gotten unnecessarily bloated because it requires a great deal of thinking to not create redundant and overlapping concepts.
gist has extensive and fine-grained disjointness (aka: where relationships between two classes or concepts do not share any common instances) at the highest level in order to help you avoid making certain types of logical errors in your ontologies or data.
Learn more about gist from the source.