Easy to use CFNetwork wrapper for HTTP requests, Objective-C, Mac OS X and iPhone.

The GPUImage framework is a BSD-licensed iOS library that lets you apply GPU-accelerated filters and other effects to images, live camera video, and movies. In comparison to Core Image (part of iOS 5.0), GPUImage allows you to write your own custom filters, supports deployment to iOS 4.0, and has a simpler interface. However, it currently lacks some of the more advanced features of Core Image, such as facial detection. For massively parallel operations like processing images or live video frames, GPUs have some significant performance advantages over CPUs. On an iPhone 4, a simple image filter can be over 100 times faster to perform on the GPU than an equivalent CPU-based filter.

Localytics is the leading mobile engagement platform. We give companies the insights and tools they need to improve their mobile app acquisition, engagement and retention efforts. Our secret sauce is in the data. We use all the data surrounding users to deliver highly targeted and personalized engagement campaigns, including push and in-app messages. We then use performance data to measure and optimize those efforts toward the metrics that drive businesses forward.

A pull down to refresh control like the one in Apple's iOS6 Mail App.

Chunk-based JSON parser for Objective-C.