I like WebVOWL for visualizing the RDF ontology. Here's the pbprdf ontology displayed in it: http://www.visualdataweb.de/webvowl/#iri=https://raw.githubusercont

I like WebVOWL for visualizing the RDF ontology. Here's the pbprdf ontology displayed in it: http://www.visualdataweb.de/webvowl/#iri=https://raw.githubusercontent.com/andrewstellman/pbprdf/master/generated/ontology.ttl http://www.visualdataweb.de/webvowl/#iri=https://raw.githubu... A few years ago I put together a quick GUI in C# to make it easier to run SPARQL queries: https://github.com/andrewstellman/sparql-explorer https://github.com/andrewstellman/sparql-explorer I haven't found an RDF editor or visual tool that I like. Some people like Topbraid Composer: https://www.topquadrant.com/tools/modeling-topbraid-composer-standard-edition/ https://www.topquadrant.com/tools/modeling-topbraid-composer... (commercial, closed source)