Ugly Email for FireFox - Get back your email privacy, block email tracking
Canned Emails - A minimal site with prewritten emails
PixelBlock - Block email open tracking inside of Gmail
analyze.email - Test the spam-y-ness of your emails
MailTrackerBlocker - Developer solving interesting problems with APIs. OSS contributor (Slim Framework, rst2pdf, OpenWhisk) & amateur photographer. He/him.
Rename Email - Easily change the subject of any email, by cloudHQ