The Semantria Ruby SDK by Lexalytics connects to the API to access sentiment analysis, keyword extraction, and word categorization. Semantic web services also include examples that allow users to interact with auto-response and discovery mode.
As far as web search tools go, few have generated as much hype as Wolfram Alpha. The service, which bills itself as a "computational knowledge engine," differs from search engines such as Google, in that it does not return lists of web pages. Rather, Wolfram Alpha attempts to calculate answers to user queries. For example, a query of "los angeles county median household income" will return the result "$43,518."
A trend is starting to emerge: Advanced technologies are being made available first as cloud services that organizations can invoke easily via an API, rather than having to figure out how to deploy and master themselves. The latest example of that trend is a cloud service from AlchemyAPI that takes advantage of machine learning and computer vision technologies to allow publishers and providers of ad networks to more easily monetize content.