TestSubject - Test how your email subject line displays on mobile devices.
Canned Emails - A minimal site with prewritten emails
DeepMail - Diligently sourced emails. Accurate emails for Startups and established companies
analyze.email - Test the spam-y-ness of your emails
ShowSubjectGmail - Edit the "subject" field when replying in Gmail!
Live Phish Plus - Unlimited access to the entire LivePhish catalog