follow.it - follow.it gets publishers more followers & recurring traffic, and provides a better reading experience for followers
Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.
Feedly - The content you need to accelerate your research, marketing, and sales.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Feedio - Feedio helps bloggers manage and grow their email and RSS subscribers.
TargetBay - TargetBay is a complete eCommerce revenue generation platform.