26. Mail Chimp
This online service lets you design email newsletters, share them on social networks and integrate them with services you already use. Features include list building and management, custom forms, Facebook integration, pre-designed templates and a drag-and-drop editor. MailChimp reports show you who's opening emails and clicking on links in those emails, and it integrates with Google Analytics to show you how email campaigns affect traffic to your website. The free account is good for up to 2,000 subscribers (12,000 emails per month).