As has been noted by Gibb and Denzler in an article on the website of Opera Europa (the European opera service organization similar to those which exist in the US and Canada, OPERA America and Opera.ca) they provide specialized services to opera professionals, with the site including "casting tools, artist records, management details, productions information".
Sinalouse por Gibb e Denzler nun artigo no sitio web da organización do servizo de ópera europea, opera-europe.org (unha organización similar a aquelas que existen nos Estados Unidos e Canadá, OPERA America e Opera.ca) que proporcionan servizos especializados aos profesionais da ópera, incluíndo no sitio web "ferramentas de cásting, discos de artistas, detalles de administración, información de producións".