The Sitefinity Mailchimp add-on from Fenêtre allows you to connect Sitefinity CMS with the popular newsletter tool Mailchimp. It is built against Mailchimp API version 3.
$49.95
The Sitefinity Form Extension widget from Fenêtre allows you to extend the default Sitefinity form handling with email.
Free
The Sitefinity Twitter widget from Fenêtre allows you to connect Sitefinity CMS with the Twitter. You can show your Tweets into a widgets. Build against the latest Twitter API version.
Free