Wikidata

Query service https://query.wikidata.org
DB dump https://dumps.wikimedia.org/wikidatawiki/entities
Property page https://www.wikidata.org/wiki/Property:P25
Entity page https://www.wikidata.org/wiki/Q28640
Entity details/td> http://www.wikidata.org/wiki/Special:EntityData/Q41390.json

Some properties

P31instance of
P279subclass of
P734family name
P735given name
P1448official name
P1449nickname
P1477birth name
P1813short name
P2561name
P2562married name
P569date of birth
P19place of birth
P570date of death
P20place of death
P106occupation
P21sex or gender

Query all properties of an entity

All direct properties of entity Q560823 
SELECT ?property ?propertyLabel ?value ?valueLabel WHERE {
  wd:Q560823 ?prop ?value .
  ?property wikibase:directClaim ?prop .
  
  SERVICE wikibase:label {
    bd:serviceParam wikibase:language "en".
  }
}