Text and Publishing
DTCoreText \ Methods to allow using HTML code with CoreText
iOSFontList \ Displays all available font names and families on iOS in their corresponding font
Greenwich \ A Cocoa framework for localization
External Services / Sharing
Hardware / Sensor
QR / barcode
Tesseract-iPhone-Demo \ Demo iPhone app utilizing the tesseract library for OCR
BeaconEmitter \ Turn your Mac as an iBeacon
Algorithms / Techniques
nedtries \ A portable in-place bitwise binary Fredkin trie algorithm which allows for near constant time insertions, deletions, finds, closest fit finds and iteration
digraph \ weighted directed graph data structure written in Object-C
dawggenerator \ Fast directed acyclic word graph generator
delaunay-ios \ Delaunay and Voronoi diagram generators ported to iOS. Includes Fortune's algorithm for Voronoi generation
PESGraph \ Objective-C implementation of a Graph, along with Dijkstra's algorithm for shortest path finding
theseus \ A very flexible random maze generator, solver, and renderer for Ruby
ShapeReducer-objc \ Path optimization using the Douglas-Peucker Line Approximation Algorithm in Objective C
PerformanceBezier \ A small library to dramatically speed up common operations on UIBezierPath, and also bring its functionality closer to NSBezierPath
separable-sss \ Separable Subsurface Scattering is a technique that allows to efficiently perform subsurface scattering calculations in screen space in just two passes
smaa \ SMAA is a very efficient GPU-based MLAA implementation (DX9, DX10, DX11 and OpenGL), capable of handling subpixel features seamlessly, and featuring an improved and advanced pattern detection & handling mechanism
OpenSubdiv \ An Open-Source subdivision surface library
BayesianKit \ A Cocoa framework implementing a bayesian classifier https://github.com/lok/BayesianKit
jrswizzle \ one-stop-shop for all your method swizzling needs
Bond \ A Swift binding framework
Effects / Drawing
color \ A collection of categories and utilities that extend UIColor
ios-sample-blender \ Sample code for the Blending Modes blog post
GPUImage \ An open source iOS framework for GPU-based image and video processing
vImageCategory \ UIImage category which have vImage wrapper functions and the demo project
iOS-Adaptive-Metal-Knob \ A knob made in iOS that simulates real-time reflection updates on a brushed metal surface
DAAnisotropicImage \ DAAnisotropicImage is an anisotropic UIImage generator. Specifically, for a metallic slider knob.
ShadowedLayer \ A CALayer subclass with an approximation of Lambert shading and specular highlighting
Shimmer \ An easy way to add a simple shimmering effect to any view in an iOS app, which is particularly useful as an unobtrusive loading indicator.
Analytics / Infographics
Ads / Rating
chisel \ Chisel is a collection of LLDB commands to assist debugging iOS apps.
DCIntrospect \ Small library of visual debugging tools for iOS. http://domesticcat.com.au/projects/introspect
PonyDebugger \ Remote network and data debugging for your native iOS app using Chrome Developer Tools
MagicalRecord \ Super Awesome Easy Fetching for Core Data 1!!!11!!!!1!
fmdb \ A Cocoa / Objective-C wrapper around SQLite
AFNetworking \ A delightful iOS and OS X networking framework
Mocks / Stubs
objc-mocktail \ A simple(r) way to stub out HTTP servers in your Objective-C app https://github.com/square/objc-mocktail
SocketRocket \ A conforming Objective-C WebSocket client library.
XMPPFramework \ An XMPP Framework in Objective-C for Mac and iOS
Animation / Interactions
TISpringLoadedViews \ Some UIView subclasses which behave as though they're attached to a spring
hamburger-button \ A hamburger button transition (SWIFT)
HamburgerButton \ Hamburger button with a slick animation. (SWIFT) http://holko.pl/2014/07/15/hamburger-button-animation/
Resource / Asset helpers
iOS-Artwork-Extractor \ Extract iOS artwork and emoji symbols into png files, generate glossy buttons png files
iTunes / Payment
CargoBay \ The Essential StoreKit Companion
Finch \ Simple, low-latency OpenAL sound engine for Apple iOS
TheAmazingAudioEngine \ Core Audio, Cordially: A sophisticated framework for iOS audio applications, built so you don't have to
Physics / AI
CMTraerPhysics \ Objective-C/Cocoa port of the Traer v3.0 physics engine; with iOS demo app
Chipmunk2D \ A fast and lightweight 2D game physics library
CleverAlgorithms \ An open source book that describes a large number of algorithmic techniques from the the fields of Biologically Inspired Computation, Computational Intelligence and Metaheuristics in a complete, consistent, and centralized manner such that they are accessible, usable, and understandable.
The-Nature-of-Code \ Raw source of The Nature of Code book as well as Processing examples
CRToast \ A modern iOS toast view that can fit your notification needs
RKNotificationHub \ Make any UIView a full fledged notification center
SMPageControl \ A drop in replacement for UIPageControl with a slew of additional customization options.
objc-TimesSquare \ TimesSquare is an Objective-C calendar view for your apps.
calloutview \ A lightweight callout view class for iOS mimicking UICalloutView. http://nfarina.com/post/78014139253/smcalloutview-for-ios-7
VICMAImageView \ Content Mode Animatable Image View, change image view's content mode with your animation!
JVFloatLabeledTextField \ UITextField subclass with floating labels - inspired by Matt D. Smith's design: http://dribbble.com/shots/1254439--GIF-Mobile-Form-Interaction?list=users
RPFloatingPlaceholders \ UITextField and UITextView subclasses with placeholders that change into floating labels when the fields are populated with text. http://dribbble.com/shots/1254439--GIF-Mobile-Form-Interaction
IQKeyboardManager \ Codeless drop-in universal library allows to prevent issues of keyboard sliding up and cover UITextField/UITextView. Neither need to write any code nor any setup required and much more.
VENCalculatorInputView \ Calculator keyboard used in the Venmo iOS app
ECSlidingViewController \ Customizable sliding view controller container.
LXReorderableCollectionViewFlowLayout \ Extends
UICollectionViewFlowLayout to support reordering of cells. Similar to long press and pan on books in iBook.
UITableViewCell-Swipe-for-Options \ A reproduction of the iOS 7 Mail app's swipe-to-reveal options http://www.teehanlax.com/blog/reproducing-the-ios-7-mail-apps-interface/
UITableView-FDTemplateLayoutCell \ Template auto layout cell for automatically UITableViewCell height calculating
Templating / Automation
liftoff \ CLI for configuring opinionated defaults on new Xcode projects
KZBootstrap \ iOS project bootstrap aimed at high quality coding.
chairs \ Swap around your iOS Simulator Documents
Xcode / Deployment
ColorSense-for-Xcode \ Plugin for Xcode to make working with colors more visual
XcodeColors \ XcodeColors allows you to use colors in the Xcode debugging console. It's designed to aid in the debugging process.
synx \ A command-line tool that reorganizes your Xcode project folder to match your Xcode groups
xcconfigs \ Common Xcode configuration files/settings.
fastlane \ Connect all iOS deployment tools into one streamlined workflow https://fastlane.tools
fucking_shell_scripts \ The easiest, most common sense configuration management tool... because you just use fucking shell scripts. http://fuckingshellscripts.org
gitignore \ A collection of useful .gitignore templates
NRTouchPoints \ UIWindow subclass that simulates users touches on screen
COSTouchVisualizer \ Visualize touches, gestures and long presses on your iPhone or iPad
Kiwi \ BDD for iOS
KIF \ Keep It Functional - An iOS Functional Testing Framework
appium \ Automation for iOS and Android Apps. http://appium.io
frankencover.it \ Code coverage for iOS and OSX.
PureLayout \ The ultimate API for iOS & OS X Auto Layout — impressively simple, immensely powerful. Objective-C and Swift compatible.