AeroLeads - AeroLeads is a lead generation software which finds prospects with email and phone number.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Hunter - Find all the email addresses related to a domain
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.