This repository contains live endpoints of popular knowledge bases. This knowledge sharing ideas started when this wiki of W3C shows endpoints that are actually not available anymore. https://www.w3.org/wiki/SparqlEndpoints
https://linkeddata1.calcul.u-psud.fr/sparql
https://freebase-easy.cs.uni-freiburg.de/browse/
http://linkedgeodata.org/sparql
http://linkedgeodata.org/docs/online-access.html