iOS SDK directory
Fabulous Image Processing in Swift
TW Photo Picker
A image picker like Instagram.
THE Amazing Audio Engine
TheAmazingAudioEngine is a sophisticated framework for iOSaudio applications.
TG Camera View Controller
Custom camera with AVFoundation. Beautiful, light and easy to integrate with iOSprojects.
UI Image Helpers
UIImage Helpers lets you Create a blurred images, take a screenshot, and make a image with color. UIImage-Helpers works on iOS5.0+ version and is compatible with ARC projects.
URB Media Focus View Controller
A view controller that focuses images to their full size with physics similar to Tweetbot 3.
A simple image viewer which includes a custom transition that mimics the iOS7 Photos app image zoom effect.
YouTube Player Helper
YL Gif Image
YLGIFImage is an asynchronized GIF image class and Image viewer supporting play/stop GIF images. YLGIFImage makes you of far less memory. Implementing a GIF usually will cost almost 600MB memory if it is fully decoded (800x600x389x4 Bytes), but using YLGIFImage would greatly reduce this to just about 30MB memory.
XCD You Tube
XCDYouTubeKit is a YouTube video player for iOS, tvOS and macOS. XCDYouTubeKit is compatible with iOS8.0 or later, macOS 10.9 or later, and tvOS 9.0 or later devices.
YY Web Image
Asynchronous image loading framework.
An audio and video manipulation and streaming pipeline with support for RTMP.
A small library that makes it easy to download and display remote images.
YK Media Player Kit
Painlessly and natively play YouTube, Vimeo, and .MP4, .MOV, .MPV, .3GP videos and fetch thumbnails on your iOSdevices
OneV's Den is a chinese developer that specialises in the developement of iOSapplications. has a plethora of SDKs available to developers, mostly availabel via a github repo.