StatCounter is a free web traffic analysis service, which provides summary stats on all your traffic and a detailed analysis of your last 500 page views. This limit can be increased by subscribing to their paid service. The StatCounter TYPO3 Extension brings you all the powerful StatCounter features to your TYPO3 site. statcounter.com/features/
Twitter for Websites is a suite of tools bringing Twitter content and functionality to your website page with Like, Retweet and Reply etc., functionality to your tweets directly from your TYPO3 website.