CrunchBase – Free Technology Company Database
http://www.crunchbase.com/

CrunchBase is the free directory of technology companies, people, and investors that anyone can edit. It is developed and maintained by TechCrunch with the support of the tech community and visitors like you. If you have any questions about CrunchBase or the data contained within, please feel free to contact them. Currently, all additions and edits to CrunchBase go through an approval process before they are pushed live. They are working on ways that will allow users to make immediate changes to the site. Expect to see this type of functionality rolled out soon. This has been added to Directory Resources Subject Tracer™ Information Blog. This has been added to Reference Resources Subject Tracer™ Information Blog.