HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
Pardot - Salesforce B2B marketing automation
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.