TestSubject - Test how your email subject line displays on mobile devices.
Callblock - The first app to block telemarketers automatically in iOS
Canned Emails - A minimal site with prewritten emails
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
analyze.email - Test the spam-y-ness of your emails
SpoofCard - Disguise your Caller ID