Mosaic - Mosaic provides brands with solutions to store and categorize their digital graphic and photography files for quick and easy retrieval.
Stannp - Stannp helps to create and send postal Direct Mail campaigns: letters or postcards.
Wunderman - Combining creativity and data, Wunderman is a leading digital agency with 200 offices in 70 countries. Headquartered in New York, Wunderman is part of WPP.
Lob - A simple API to integrate print & mail solutions into your applications.
Relevant - Get a glance of your favorite apps and websites in one place
Docsmit Mail - Send USPS Certified, Priority and First Class mail from Windows, Word or Web. API too.