There might be some services here to try out: https://docs.google.com/spreadsheets/d/1hif4buUftI8FYD2r5g6rEw3UvWl4zwt5Ep44QI2RksY/edit#gid=16
Also look at:
violanorbert.com
Interseller
Lush
getemail.io. It's a chrome extension
Used to use Hunter.io before linkedin shut-off their chrome extension support
LeadIQ (an Alchemist company)
Groove (an Alchemist company)
growbots
apollo.io for prospecting, automating outbound - its great! and it integrates with salesforce which is super helpful