Link for convenience [1]. I have yet to find anything on par with the Stanford Encyclopedia of Philosophy (SEP) for other fields. It truly is an amazing, expert-curated project.

If anyone else has an interest in the semantic web or ontologies [2] in general, you might have a look at the Indiana Philosophy Ontology project [3]. It works to use data from SEP and other sources to build a ontology of the field.

[1] https://plato.stanford.edu/

[2] https://en.wikipedia.org/wiki/Ontology_(information_science)

[3] https://www.inphoproject.org/