FMEngine is an Objective-C framework created for the Last.fm API. The framework doesn't parse output from the Last.fm API, so users will need to use their own parsers. FMEngine can be used in iPhone and Mac OS X applications and is released under the MIT License.
FlickrKit is a library written in iOS Objective-C to help developers access the Flickr API. It is currently used by the Galleryr Pro iPad app.The library requires iOS 6.0 or above and has not been tested with older iOS versions.
ObjectiveFlickr is a framework for implementing the Flickr API in Objective-C. ObjectiveFlickr was designed for use in Mac and iPhone applications, but since it was developed for iOS 2.0, it may require some updates to match the current iOS version.
Facebook Warns iDevice App Developers to Upgrade Early to Graph API v2.0
The Affdex Mobile SDK by Affectiva is a facial expression analysis tool, used by researchers and marketers alike to learn more about customers and their interaction and emotive response to ads, branding, and any type of media. Designed for mobile iOS applications and backed by MIT scientific research, the SDK offers a rich package of varied emotions and measurement preferences, with a dashboard to display and track results.
The DocuSign Mobile SDK for iOS allows developers to integrate Digital Transaction Management services and eSignature functionality into mobile apps. With the SDK, developers can implement functionality such as signing and completing document-based transactions as well as hosting in-person signing sessions from within a mobile app.
The Google APIs Client Library for Objective-C is a flexible, efficient library provided by Google for accessing its JSON-based APIs. This Library is recommended for applications that will be used on iOS or Mac OS X systems.
HelpStack provides developers with a simple way of adding in-App support for iOS App users. Developers can also integrate HelpDesk solutions. HelpStack currently comes with three plugged in Help desk solutions - Desk.com, Zendesk and HappyFox.