The Simple Postcard - Text a photo to mail it as a postcard
Lob - A simple API to integrate print & mail solutions into your applications.
Felt for iPhone - Handwritten cards for the modern world
PostGrid - Transform your Offline Communications. Use our fully-documented REST API to send personalized letters, checks, postcards and improve address accuracy.
Send Mail Get Mail - A postcard-sending website.
Postalytics - Automated direct mail software that’s faster, smarter & better. Postalytics sends personalized direct mail from your CRM and analyzes delivery & response.