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