Leadfeeder - Leadfeeder converts your website visitors into sales. Connect your website's Google Analytics to Leadfeeder and unlock the power of seeing who`s visiting your site!
Hunter - Find all the email addresses related to a domain
Clearbit - Clearbit provides Business Intelligence APIs
Albacross - The world's first free B2B Lead Generation Network. Albacross help companies master their B2B digital marketing with Lead Generation and targeted marketing
Lead Forensics - B2B website analytics and lead generation.
Upscribe - Embeddable lead generation forms for Medium