mail-tester.com : Free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems
Commento : A lightweight, open source, tracking-free comment engine alternative to Disqus.
Kill the newsletter! : I love newsletters, but I hate receiving e-mails. Call me an oldie, but I still use RSS feeds to read my news and e-mails for communication. And I pre...
Postal : Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready f...
Tutanota : Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service based on this software
