Apollo.io, SellHack, Norbert, TRGTR.IO, AnyLeads, Kendo Email Finder, Aprive, Klenty, Closely, Dropcontact, Leadberry, Prospect.io, W3rocks, Interseller, Find Any Email, Qureet.com: Lead Generation On Twitter, AnyMailFinder.com, AeroLeads, Oxyleads, Gardener.gg, Salestools.io, LeadVantage are some alternatives to LeadGibbon.