Squarespace Email Campaigns - Email, but pretty.
ConnectAndSell - Delivering live conversations with inbound leads, on demand.
Lob - A simple API to integrate print & mail solutions into your applications.
Koncert - Multi-channel sales engagement with personalization at scale.
PostGrid - Transform your Offline Communications. Use our fully-documented REST API to send personalized letters, checks, postcards and improve address accuracy.
Velocify Lead Manager - Lead Scoring