The Lymbix Sentiment Analysis .NET SDK by Lymbix wraps the API to access sentiment analysis features that developers can implement in text based applications. Models and properties are part of the resources on GitHub.
Microsoft's latest version of its search API (our Live Search API Profile), which was released last November as a public beta, seems to be gaining quite a bit of momentum. According to a recent post on the Live Search Blog, the API is serving more than 3 billion queries per month, more than 5,000 applications to use the API, and queries from third party sites account for 80% of the API's query volume.
Saplo is a Swedish incarnation of semantic analysis. Born out of academia, the Saplo API is built on computer science and applied mathematics. This company is effectively commercializing academic research topics. What makes Saplo stand out immediately as an API provider is its list of active customers which includes two Nordic news sites. This shows that they are serious about the business behind the Saplo API and also successful at convincing experienced media players that semantic analysis is a tool that they should employ.