Description: Quora is a popular question-and-answer website where users can post questions and get answers from a community of experts and other knowledgeable people. Its focus is on gaining and sharing knowledge.
Type: software
Description: Wikidata is a free and open knowledge base that can be read and edited by both humans and machines. It acts as central storage for the structured data of its Wikimedia sister projects including Wikipedia, Wikivoyage, Wiktionary, Wikisource, and others.
Type: software
Pricing: Free