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.
Sentiment analysis, stemming and lemmatization, part-of-speech tagging and chunking, phrase extraction and named entity recognition.
Multilingual text understanding API: developers can extract keywords and entities from unstructured documents and short pieces of text, and enrich them with information extracted from resources of the Linked Open Data cloud, such as DBPedia or Freebase. Other features include text comparison, summarization, and language detection. Available in 30+ languages.
CamFind API is the image recognition and reverse image search that powers the popular mobile visual search engine app, CamFind. It is the welcomed replacement for the void left following the purchase of IQ Engines by Yahoo!. CamFind API promises to be the best solution for state of the art image recognition and reverse image recognition, which developers can incorporate into both apps and web applications.