Submit queries to and retrieve results from the Bing Engine.
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API Providers learn more about Provider Consoles
Shorten, Share and Track your links with the Bitly APIs.
Create, edit, query and delete blog posts, or create gadgets for Blogger users.
Access Telefónica network services like sending messages, getting an Ad, or real-time end-user information.
Add BoxCar services to your app so users can get messages and update all their favorite social services.
Make Constant Contact's leading email and event marketing services accessible directly from your app.
Context.IO is the missing email API that makes it easy and fast to integrate your user's email data in your application.
Keep, share and discover the best of the Web with Delicious APIs.
Help classroom projects by integrating project information and donation functionality into your app.
Gain access to billions of data points about music, including artist info, taste profiles, playlists and more.
Bring Etsy's handmade marketplace and community into your apps.
Test against Etsy's non-production data learn and explore (Sandbox API).
Build applications with facial recognition capability.
Connect to the social network with the Graph API.
Bring Fitbit health data into your apps, including user activities, sleep, heart, glucose and blood pressure information.
Checkin, explore your city and connect people and places (API v2).
Explore, upload and organize photos on Flickr
Read and write access to the Freebase graph of people, places and things.
Perform secure source code hosting and collaborative development with GitHub's v3 API.
Perform secure source code hosting and collaborative development with GitHub's v2 API.
Create sidebar and contextual gadgets and access the Gmail inbox feed.
Access and manage your AdSense earnings and inventory, and generate custom reports.
Extend the functionality of Google Analytics by accessing profile and reporting data.
Leverage Google Books content with full-text search and book information.
Build apps that can edit, create and delete Google Calendar events and invitations.
Access and update Contacts so your users can communicate across phone, email and IM.
Create, retrieve, upload and copy Google documents.
Let your users update and read their current location, history and more.
Harness Google's cloud-based machine learning tools to analyze your data.
Publish and edit Sites content, including comments, revisions and pages.
Manage and search Spreadsheet worksheets, cells and lists.
Bring Google Tasks content and metadata into your apps or websites.
Include high-quality web fonts in any web page.
Keep up with your friends, share the places you go, and discover the extraordinary in the world around.
Put all those great ideas for Groupon improvements, extensions, and multiple-platform interfaces to work.
Manage your Heroku apps, configs, collaborators & resources
Fast, beautiful and fun way to share your life with friends through a series of pictures.
Bring user profiles and professional networks to your apps.
Create plugins that connect MailChimp to your CMS, your blog, your e-commerce shopping cart, and more.
Milo's open API adds local commerce to your app with data on millions of local products across more than 50,000 US stores.
Create apps and games within the MySpace platform. Monetize through advertising and virtual goods.
Open source Node.JS hosting Platform-as-a-Service.
Find breaking news, multimedia, reviews and opinion on Washington, business, sports, movies and more.
Build OpenSocial-based applications for orkut's world-wide user base.
Integrate PageSpeed performance analysis into your development workflow.
Bring payments to apps, mobile and social with Adaptive Payments (Sandbox API).
Create buttons to export images from Picasa into other apps and services. (Active but deprecated by Google)
Store, manage and share bookmarks on Pinboard
Access and manipulate agile project management data including projects, stories and tasks.
Find the front page of the internet with Reddit APIs.
Easily and legally access and play music across web and mobile devices.
Access Rhapsody technologies and content, including metadeta, search and music player.
Interact with RubyGems.org to query and create gems, manage owners and more.
Explore the beta Salesforce REST API to integrate CRM.
Create applications for the social enterprise with Salesforce's collaboration platform
Allows SendGrid customers to retrieve account information such as statistics, bounces, spam reports, and unsubscribes.
Shopping.com offers Publishers rich content via the Shopping.com's API.
RESTful SMS API for sending and receiving text messages
Access, host, upload, and comment on audio.
Access, host, upload, and comment on audio (Sandbox API).
Expore Spotify's music catalog, with search and look up for artists, tracks and albums.
Create apps or scripts that can access Stack Exchange questions, answers, comments, badges and more.
Tumblr let's you share anything. Post content from any app with the Tumblr API.
Tropo is a cloud communications API and platform for building scalable Voice and SMS applications.
Telephony platform that exposes SMS and voice capabilities.
Access user data, geo, statuses and more with Twitter's REST API.
The Urban Airship's API powers mobile applications with push, rich push, in-app purchases and subscription services.
Usergrid is a highly scalable platform for managing users and data for mobile apps via an easy-to-use, free API.
Build your own weather app, with the WeatherBug API
Welcome to the RESTful APIs exposed through the World of Warcraft community site as a service to the World of Warcraft community.
Get forecast and weather data with complete geolocation services, global coverage and more.
Access up-to-date weather information for your location, including condition codes.
Use YP Places API to power your web and mobile apps with business listings, reviews, maps and much more...
Get "YouTube on any screen, any time." Integrate video content and functionality into your website and apps.
Search the Zappos catalog and much more.
Launch the generic Apigee Console to interact with other APIs.
Is there an API you'd like to see here? Let us know!