The Semantria Node.js SDK by Lexalytics connects to the API to access sentiment analysis based on semantic web. Entity extraction, keyword extraction, categorization, classification, and summarization are the features included in the kit.
If you've ever wanted to know what's happening with your web site as it's happening, you may want to take a look at real-time web site analytics provider Chartbeat. It's a new and very slick service that provides a rich set of real-time analytics. They offer a range of useful tools like their Real-time Dashboard (shown below), traffic alerts (ex: get an email if you've got an above average burst of site visitors), and their API (our chartbeat API Profile).
Aerohive launched a new API-driven platform that pulls data from Wi-Fi networks for use by various business applications. The platform includes a number of APIs, primarily around location, identity, and monitoring. The platform exchanges data with both network devices and end user devices.