From Orange: The Authentication API alpha is part of the Personal APIs suite and has two different purposes: First, it enables basic authentication and privacy functionality. Second, it simplifies access to your website for Orange users by allowing them to use their existing Orange account credentials. This is done with the customer's knowledge and consent and is applicable to registered users of www.orange.fr. Use of this API is mandatory if you wish to use the other Orange Personal APIs.

The click-to-call API from Orange allows you to establish phone calls between two numbers within your web application. Phone calls can be established between any landline, mobile and VoIP terminals in most countries throughout the world. The API is not limited to Orange customers, it can be used to connect anybody. Phone numbers can either be displayed or hidden from the connecting users. Please note, calls to premium numbers are not permitted. Use this API to establish calls between users of your application, or let visitors call you from your blog / website.

The Orange Contact Everyone API enables broadcasting of messages in various formats (SMS, voice mail on fixed or mobile phone, e-mail, fax) to more than 200 countries.

The Device Capability Enabler API allows developers to query an extensive, and up-to-date, mobile devices database maintained by Orange. The content can be used to adapt application screens to the capabilities of mobile devices.

This Orange API allows you to locate a user's mobile location within your web application.

The Orange multimedia conference API enables your application to access a real-time collaboration solution. With the Multimedia Conference API, your application users can organise remote meetings on the web (web conference) and via the phone (audio conference).

From Orange : The Personal Contacts API gives your application real time access to contacts of Orange France customers, enabling you to view their address book and add new entries, with their permission. Part of the Personal APIs Alpha suite.

From Orange: The Personal Messages API gives your application real time access to the message boxes of Orange France customers, enabling them to be alerted of their emails at any time. And soon they will be able to check their SMS, MMS, and much more. Part of the Personal APIs Alpha suite.

From Orange: The Personal Photos API gives your application real time access to the photo albums of Orange France customers, enabling you to view photos and add new photos, with their permission.

From Orange: The Personal Profile API gives your application real time access to Orange France customers' profile information, enabling you to retrieve data such as name, email, address, phone number, etc., with their permission. Part of the Personal APIs Alpha suite.

Orange now offers several APIs for all types of Web 2.0, SaaS and Social Network solutions.
Additional Social Network-related API's:

Open Social API

Facebook API

Digg API