Yahoo Spelling Suggestion

The Yahoo Spelling Suggestion service provides a suggested spelling correction for a given search term.
Yahoo Spelling Suggestion

AddThis Sharing Endpoints

AddThis is a free way to boost traffic back to your site by making it easier for visitors to share your content. The API is a set of URL endpoints that allow you to share content from your website to any of the AddThis 200+ supported destinations. Lets you share links as well as embeddable content.
AddThis Sharing Endpoints

bicingwatch

API offering a listing and mapping of all bicing stations in XML, JSON and text formats. Very limited documentation
bicingwatch

Global Giving

GlobalGiving is an online marketplace that connects you to the causes and countries you care about. You select the projects you want to support, make a tax-deductible contribution, and get regular progress updates - so you can see your impact. GlobalGiving API is based on a set of RESTful web-services through HTTPS which provides the simplest and quickest way to access information for GlobalGiving projects and to submit a donation.
Global Giving

AddThis Analytics

AddThis is a free way to boost traffic back to your site by making it easier for visitors to share your content. The AddThis Analytics API is a RESTful web-service you can use to access the analytics data about sharing taking place on your site, without using the AddThis analytics interface. You can use this to build your own reports, for example.
AddThis Analytics

18amail

An API to remotely connect to the 18amail.co.uk email marketing service. Quick and simple to hook up to an existing membership based website and populate your 18amail mailing lists. Then send out and track email newsletters.
18amail

Readernaut

Readernaut is a free service that lets you write reviews, keep notes, make reading lists, track your reading progress and find your friends. Readernaut API is a RESTful API for integration with third party applications.
Readernaut

Mobile Vikings API

Mobile Vikings is a Belgian internet mobile virtual network operator on top of the base network. Mobile Vikings offers an API to monitor your current credit balance, call history and top up history. This REST API uses basic HTTP authentication and the response format can either be json or xml.
Mobile Vikings API

LiveAddress Verification

Super-simple and super-fast US address verification. Validate street addresses within your application or on your website. Obtain valuable information about addresses, including whether they can receive mail and shipments. LiveAddress API scales in the cloud based on demand, and is hosted out of 3 reliable and redundant datacenters across the nation. Submit up to 100 addresses per request, and don't pay for addresses that don't validate. Get started anytime with a "free forever" subscription of 250 lookups/mo. Unlimited and reseller plans are available.
LiveAddress Verification

Taykt

The Taykt API allows developers to control your Taykt account, including changing message content, viewing activity, creating new messages, and dynamically responding to an SMS message on their own applications.
Taykt