DBits Group has Add-ons for the Concrete5 CMS. Product descriptions and user documentation are available here. The Add-Ons may be obtained from the Concrete5 Marketplace.
Currently available add-ons:
Linkbar - A navigation block with configurable display characteristics and a dashboard interface to manage the links displayed globally within the linkbar blocks throughout your site. Use Linkbar to display links to external affiliates or other sites you wish to promote from your site. The dashboard interface provides fields to save contact information with the link code for easy reference by the site administrator.
Facebook Integrator - helps you connect with multiple Facebook Applications within your site using Facebook social plug-ins. You can set OpenGraph headers for separate pages using the Like Button block to integrate your pages with Facebook, use "Login with Facebook" to register and login visitors, enable real-time comments on events, show activities related to a specific page, and link comments on your pages with the appropriate Facebook Apps.