Mailtrap.io - Mailtrap is a fake SMTP server for development teams to test, view and share emails sent from the development and staging environments without spamming real customers
Printer Pro - Print attachments, receipts, documents, web pages from your iPad and iPhone.
Mailosaur - Email Testing for QA & Development Teams.
PrintNode - PrintNode offers cloud printing solutions for web applications.
FakeSMTP - FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily.
ezeep - ezeep provides managed cloud printing solutions for educational institutes and SMB's.