Central Registry of Companies
Provides summarized information concerning the legal structure of businesses. Spanish and English

SpainTrade.biz
B2B site for international business with Spain. Members have an individual page where they can publish trade leads in four languages and add photos via upload function.

Planetliquor.com
The wine and spirits portal providing business directory, trade leads, free classifieds, shopping, online library, and eCards.

Estrella Polar
Business directory, search engine and resource listings in Spain.

Directorio NH Hoteles
Complete guide of business hotels in Spain offered by NH.