Resource for company relationship

I can't speak to an open source for the *data*, but the 
FinancialInstrument package (on R-Forge) is extensible as to what 
attributes you choose to store, and can create hierarchies of any 
attributes that you apply to instruments.

Otherwise, probably build a database for your reference data.

Regards,

Brian

Hello folks,

Is there an open source resource (or an R package) to get company
relationships, such as competition, supplier etc?
Hoover seems to provide this information.

What is the best approach to create a custom mapping?

Thanks
Anshul