The PeerReach API allows you to give context to the content produced by any Twitter profile. PeerReach has analysed over a 100 million accounts and can return information like, expertise area's. interests, gender, age and location. This free version of our API allows you to make 2400 daily calls.
Sentiment analysis and keyword extraction for English, French, German, Russian. See http://www.skyttle.com for demos, tutorials and example clients. The API is reachable on https://sentinelprojects-skyttle20.p.mashape.com/ . Support for languages other than English is currently available only on custom pricing plans - please get in touch with us if you'd like to use the API for these languages.
DuckDuckGo Zero-click Info includes topic summaries, categories, disambiguation, official sites, !bang redirects, definitions and more. You can use this API for many things, e.g. define people, places, things, words and concepts; provides direct links to other services (via !bang syntax); list related topics; and gives official sites when available.