Similar to レファレンス協同データベース

Recordset

Contacts (Apple)

Worldbeam

Data store

BioOne

ChemSpider

Flags of the World (website)

Fussballdaten.de

Glottolog

Google News Archive

Internet Speculative Fiction Database

Marxists Internet Archive

NASA Space Science Data Coordinated Archive

Structurae

Visual.ly

Web of Science

ArXiv