APIs

Buffer - Social

Yammer - Enterprise

Balanced Payments - Financial

Box - Storage

Asana - Search

JSON API - Backend

StockTwits - Financial

Last.fm - Music

JavaSE6 - Enterprise

JavaSE7 - Enterprise

JavaFX - Enterprise

Fitbit - Health

Groupon - Shopping

Google Analytics - Tools

We the People API - Messaging

Pinboard - Tools

bitly - Search

Bitbucket - Search

LinkedIn - Social

Foursquare Core API - Maps

Stack Exchange - Tools

DeployGate - Tools

Etsy - Entertainment

Bing Search API - Search

Reddit - Entertainment

Parse - Backend

Github - Tools

HNSearch API - Search

Google Drive - Storage

Stripe - Financial