OpenMoves - OpenMoves is an email and search marketing solution.
Stannp - Stannp helps to create and send postal Direct Mail campaigns: letters or postcards.
KlientBoost - KlientBoost provides pay-per-click marketing and landing page solutions.
Lob - A simple API to integrate print & mail solutions into your applications.
CIENCE - Managed sales acceleration company, where we help to grow your business.
Docsmit Mail - Send USPS Certified, Priority and First Class mail from Windows, Word or Web. API too.