Checkfront

Checkfront is a booking service that allows businesses to manage their schedule based inventories, centralize reservations, and process payments online. It can be used to manage accommodation, events, rentals and professional service bookings.
Checkfront

Grooveshark

From the website: "Grooveshark makes available methods for accessing and interacting with Grooveshark data. This API is experimental, and may change. At present all methods require a "method signature" which means you need a web services key and secret to access them."
Grooveshark

Yahoo PlaceFinder

The Yahoo PlaceFinder API gives developers multi-language global geocoding of named places. PlaceFinder supports building-level address recognition in over 75 countries, and points of interest, airports, cities, and other place names (including administrative areas) for these countries and the rest of the world. In addition to supporting free-form, single-line, and multi-line address inputs, PlaceFinder also supports queries that include cross streets, WOEID, and IATA airport codes. It also supports reverse geocoding: you can give it a longitude/latitude coordinate and get back the nearest address.
Yahoo PlaceFinder

Open Dining Network Food Ordering

The API provides functionality for consumers and restaurants to access the Open Dining Network for viewing menus and placing or taking meal orders. The Open Dining Network lists menus for restaurants for customers to search and order from via web and mobile devices. The REST API allows for common consumer tasks such as searching for nearby restaurants or menu items, viewing a restaurant or menu item's details and building an order. For restaurants, the API allows for common administrative tasks such as adding a new menu item, updating existing menu offerings and changing business hours. Additional information at http://support.opendining.net/customer/portal/topics/554435-api-reference/articles
Open Dining Network Food Ordering

lukup

Users can enhance their apps using lukup APIs for cross platform messaging, search, news feeds, contacts, location, etc. lukout is a location based search and messaging widget for mobile phones. lukup provides APIs to enable applications 'written once, to run on multiple consumer devices (mobile phones, desktops, etc)' and enable them to connect to multiple social networks (facebook, twitter, google, yahoo). Documentation is provided for a RESTful API with responses in JSON. A JavaScript API is also available.
lukup

Kumutu

The Kumutu API allows users to interact and "sync" with suppliers from your own web sites and applications. Kumutu gives adventure operators an exclusive opportunity to market, sell and distribute their activities from one central location. Kumutu provides a distribution system for adventure activity operators and activities worldwide via a Rest XML and JSON API. Operators and activities include white water rafting, rock climbing, kite surfing, scuba diving, surfing, etc.
Kumutu

Kwwika

Kwwika is a real-time push notification, messaging and data distribution service that lets you instantly push information to, and receive information from, any device connected to the Internet. Kwwika works with any web-enabled device - from a desktop computer to a refrigerator, a smartphone to a games console, a satelite to a television. Kwwika provides you with everything you need to communicate in real-time in solutions such as a real-time messaging application, real-time push application, real-time API, cross platform multiplayer games service or anything else you can think of. We provide the infrastructure and the client APIs so that you can concerntrate on realising your application or solution.
Kwwika

HasOffers

HasOffers is an affiliate network software that offers a complete suite of tools for building an affiliate network. You can use the software to track offers, review reports, manage affiliates and advertisers. The HasOffers application makes it easy to start your own branded affiliate network in minutes.
HasOffers

TeachStreet Classes and Courses

TeachStreet is home to the largest selection of local and online classes, lessons and workshops in more than 500 subject areas. The TeachStreet API empowers partners and web application creators to build upon this course data. The TeachStreet Classes & Courses API provides access to TeachStreet's class/course search engine, delivering local and online class listing data and metadata. It uses RESTful calls and responses are formatted in JSON.
TeachStreet Classes and Courses