MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
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.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
GetResponse - Email marketing from GetResponse. Send email newsletters, campaigns, online surveys and follow-up autoresponders. Simple, easy interface. FREE sign up.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.