Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Kyte - India's first AI powered SMS inbox
Mailwasher - Over 8 million people use MailWasher as their spam filter
Hiya - Know who's calling or texting and block spammers on Android
SPAMfighter - SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird