» About.com: Opera    Guide featuring links to selected sites.    http://classicalmusic.about.com/od/opera/

» All About Opera    Features information in a searchable database about composers and operas, and includes related news headlines.    http://www.allaboutopera.com/

» Opera Basic Dictionary    Devoted fan Mario Biondi has compiled lists of more than 1,500 operas by more than 500 composers, with their countries and dates, as well as thousands of performers and recordings. Searchable by title, composer, and performer. [English and Italian]    http://www.mariobiondi.net/opere/diz_opera_.html

» Opera Italiana    Links to Italian composers and their operas with biographies, and libretti. [English and Italian]    http://www.operaitaliana.com/

» Operabase    News and reviews, performers and artists, opera houses, recordings and web resources, plus booking details, interactive maps, search tools and timelines. [Dutch, English, French, German, Italian, Portuguese, Spanish]    http://operabase.com/en/