Inkit - Direct Mail Software. Inkit is an inbound and outbound marketing platform that helps companies gain visitors, convert leads, and win sales.

Lob - A simple API to integrate print & mail solutions into your applications.

Opportunity Knocks - Opportunity Knocks helps companies get better marketing results through targeted postcard marketing campaigns.

PebblePost - PebblePost invented Programmatic Direct Mail® to transform real-time online activity into personalized, dynamically rendered direct mail.

Asend Direct - Ascend Direct offers performance-driven direct mail programs.

Squarespace Email Campaigns - Email, but pretty.