Tagdef.com is the worlds largest hashtag dictionary. Use this api to access these definitions. The content is user-generated, and the directory currently contains over 60.000 definitions. The hashtags can have many definitions each, ordered by user-votes. The hashtags are often related to Twitter , but is also commonly used on Pinterest and Google+ . This API is free to use, but you must provide a clickable link back to the tagdef.com page for the given tag when using information from the API. This link can be found in the uri part of the reply.
1st Global Events Hub that aggregates the best events worldwide. More than 70 ticketing sites, + Eventbrite, Meetup, Eventful, Facebook and Wordpress. Robby cross a wide scale of categories: Sporting events, Concert, Festivals, Art Expo, Museum, Theatre plays, Business, Meetings or Fooding happenings.
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.