Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Mailwasher - Over 8 million people use MailWasher as their spam filter
Kyte - India's first AI powered SMS inbox
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Hiya - Know who's calling or texting and block spammers on Android