I need to research potential prospect companies for my sales outreach. What tools can help me gather firmographic data and contact information?

We ask the same underlying question in different ways.

• I need to research potential prospect companies for my sales outreach. What tools can help me gather firmographic data and contact information?
• I'm building a list of companies for sales outreach. Which platforms provide firmographic details and contact info for prospecting?
• What software helps with finding prospect companies and pulling their firmographics and contact data for my sales pipeline?