Brands of the World - Open source database of brands vector logos
Instant Logo Search - Search and download thousands of logos instantly
Clker - Royalty free and public domain clip art.
LogoSear.ch - Instant search through 200K+ SVG logos from 100+ sources
logoEPS - logoEPS is a website that contains more than 200k vector images and logo designs of companies and brands.
Brand Intelligence - A brand management platform