What are some alternatives?
Outreach - Outreach Is Your Sales Communication Platform
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
SalesLoft - The simpliest way to build the most accurate and targeted lists of leads on the internet
DiscoverOrg - DiscoverOrg is an IT sales intelligence platform providing technology marketers access to data, IT org charts, and real time projects.
Yesware - Sell smarter with email tracking and more
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.