FeedWind - FeedWind is the world's leading RSS widget, Facebook widget and Google Calendar widget - works on any website and is fully customizable
RevResponse - RevResponse empowers advanced Publishers to viably adapt all types of B2B activity by means of automatic promotion advances, local publicizing, and the biggest stock of expert substance.
Feedly - The content you need to accelerate your research, marketing, and sales.
AWeber - AWeber is an Email marketing software that's easy to use. Send email newsletters & autoresponders and deliver top notch emails.
Superfeedr - Real-time feed API - RSS and Atom over PubSubHubbub and XMPP. Superfeedr pushes RSS feeds in real-time for both publishers and subscribers, with open protocols and APIs.
Yodle - Yodle is a leading local online marketing company with 50,000+ local business customers.