Google Analytics is a service offered by Google that generates detailed statistics about a website's traffic and traffic sources and measures conversions and sales. Google Analytics can track visitors from all referrers, including search engines and social networks, direct visits and referring sites. It also displays advertisin...
Chartbeat is a betaworks company that provides realtime analytics to Websites and blogs. It shows visitors, load times, and referring sites on a minute-by-minute basis. The service also provides alerts the second your Website crashes or slows to a crawl.
Sentry provides real-time crash reporting for your web apps, mobile apps, and games.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.