Affinity - Relationship Intelligence, Reimagined
Hunter - Find all the email addresses related to a domain
Zapflow - Zapflow is a cloud-based tool for professional investors to manage their deal flows.
AnyMailFinder.com - Find anyone's email address
Attio - Attio is a radically new type of CRM that is real-time, entirely customizable and intuitively collaborative. Using Attio, your team can create, build and deploy your CRM exactly as you want it.
Norbert - Norbert is an online tool that helps you to find anyone’s corporate email address.