Encyclopedia.com
"Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE, online library."(meta name="description")
NDC: 033
Encyclopedia Britannica
"Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts."(meta name="description")
NDC: 033
Encyclopedia Britannica
"専門家による何十万の客観的な記事、伝記、ビデオ、画像からなるファクトチェック済みのオンラインブリタニカ百科事典を探索してください。"(meta name="description")
Citizendium
Citizendium
"Welcome to Citizendium, a wiki for providing free knowledge where authors use their real names. We regard information as a public good and welcome anyone who wants to share their knowledge on virtually any subject. Our online community prides itself on being congenial and supportive."
NDC: 033