Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
TapText - Send canned text messages with a single tap
Kyte - India's first AI powered SMS inbox
analyze.email - Test the spam-y-ness of your emails
Hiya - Know who's calling or texting and block spammers on Android
Rename Email - Easily change the subject of any email, by cloudHQ