AtroPIM - AtroPIM is a free, 100% open source and configurable PIM solution. It's easy to keep catalogs up to date, add new products or change existing ones, deliver your current product information across all channels.
Clearbit - Clearbit provides Business Intelligence APIs
Pimberly - The most powerful Product Information Management platform on the planet.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Bluestone PIM - Sales depends on how well you present your product.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.