When conducting account based (ABM) research, it is necessary to develop a broad view of your customers and prospects which includes company, contact, and industry research. Unfortunately, open web research is quite time-consuming and your sales reps are unlikely to consistently engage in general research, so consider Sales Intelligence vendors with editorial research teams.
Executive research should go beyond the Leadership page and LinkedIn profiles. One option is Boardroom Insiders which gathers rich executive profiles on CxOs written by business journalists.
For industry research, look at Vertical IQ, IBISWorld, or First Research. Vertical IQ and First Research are strong offerings for sales teams that sell broadly across many segments but are not verticalized. They are written in plain English and include Q&A sections. The content in IBISWorld is more formal but better suited for verticalized teams.
At the company level, consider Dun & Bradstreet Hoovers, InsideView, or DiscoverOrg. All three provide company and contact profiles, list building, and sales triggers. D&B Hoovers goes deeper on global coverage, family trees, and industry profiles, DiscoverOrg offers the deepest set of technographics and rich bios, and InsideView provides excellent sales triggers and social media intelligence.