I have yet to try these, but they look awesome.

• SwiftyAttributes - create NSAttributedString easily
• SwiftLinkPreview - extract URL’s title, preview image
• iOS 10 drawer UI - Pulley and SPStorkController
• Permission request
• Spectrum - Lossless resize, rotate operations on image
• R - This is like Android’s R, generating a file with constants to the strings
• Ensemble - sync Core Data to iCloud or Dropbox ($299)
• Deep Belief - Image recognition
• Layout - Supports live reloading and creating view hierarchy with XML (kind of like Android). Nick Lockwood builds the higher level UI system.
• Expression - Also by Nick Lockwood. Evaluate simple expression in String such as “1 + 2”.

Segmented Controls

• BetterSegmentedControl - Swift 3, with just 1 file cleverly creates a segmented control with selected text being masked
• Segmentio - Animated segmented control
• HMSegmentedControl - Google Currents like segments
• DZNSegmentedControl - Segmented Control views

Others

• KVOController - by Facebook for observing key-value easily
• ViewDeck - Slide a view over like Path app
• JLRoutes - URL schemes
• Kiwi - BDD testing
• SCWaveformView - from audio/video
• SHUIKitBlocks - UIKit replacement - block instead of delegates
• Tweaks - a settings for on/off debug stuff, by Facebook
• LocationManager - grab once easily

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UIKit

UITextField

• GCPlaceholderTextView - also for UITextView
• MLPAutoCompleteTextField - Auto complete. Demo with countries.
• SlackTextViewController
• MPGTextField - auto complete dropdown

UIButton/Buttons

• ZFRippleButton - nice ripple effect when touch button
• FoldingTabBar.iOS - expand circular plus button to a “tab bar”

Alert Sheet/View/Popup Modal

• SHActionSheetBlocks
  • More block based libs at SHUIKitBlocks
• UIActionSheet-Blocks - easier using category
• UIAlertView-Blocks - with blocks
• AMSmoothAlert - catchy dropdown effect for 3 types: info, error, success
  • Author also has a Login VC which plays a video for the background
• MZFormSheetPresentationController - Can use storyboard to design, and it will simply fit it into a dialog/form
• DropdownMenu - Drop menu from a button
• CWStatusBarNotification - very smart way of showing in status bar (or navigation bar). It uses snapshot, a fake image view temporarily.

Pull to refresh

• ODRefreshControl - native didn’t even work
• DGElasticPullToRefresh: With animation using UIBezierPath

Slide to reveal menu

• SWRevealViewController
• PHAirViewController - like AirBnb
• iOS-Slide-Menu
• RW tutorial
• MMDrawerController
• RESideMenu

Chart

• JBChartView

Progress Bar

• YLProgressBar - nice, and without images

Image View/UIImage

• FastImageCache - Load image at higher FPS, less memory usage, by sacrificing disk usage
• JTSImageViewController - full screen, pan, zoom, flick away - like lightbox
• SDWebImage - Web view and cache and gif. But they say AFNetworking provides the same
• PAAImageView - Rounded, using AFNetworking and lightly cached
• ZDStickerView - edit with 1 finger
• UzysImageCropper
• TDImageColors: Detect most used color
• UIImageViewModeScaleAspect - Animate between 2 contentMode

Graphics

• NXDrawKit - draw on view, written in Swift
• jot - Add touch-controlled drawings, by IFTTT

Map View

• Clustering
• FBAnnotationClustering
• CCHMapClusterController

Activity

• NVActivityIndicatorView - Collection of nice loading animations

Tags/Tokens

• JSTokenField - similar to SMS recipients
• TLTagsControl - with mode editable

Effects

• Shimmer - A shimmering effect to show progress
• DEInfiniteTileMarqueeView - marquee image
• UIImage-BlurredFrame - apply blur
• RQShineLabel - UILabel random char fade in
• FXBlurView
• YIInnerShadowView - Drop inner shadow

Other Views

• 10Clock - Circular sleep to wake period
• Eureka - Create forms eg section +++ row
• SZTextView - UITextView with placeholder
• Flat UI
• MDCSwipeToChoose
• RAMReel - a text field and list selector, that animates beautifully
• RPSlidingMenu - a parallax effect as you drag in the collection view
• Chameleon - Auto color scheme

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VoIP/SMS/Calls

Sinch - rebtel using? Seems mature. Talked about PushKit.

Multiple libs-in-1

twotoasters (pod subspecs! but not popular lib)
DerpKit - KVO+blocks and others

Swift Web Frameworks

This is not iOS, but Swift. And for sure many web frameworks will be created, just like JS.

• https://github.com/qutheory/vapor
  • Inspired by Laravel. Pretty comprehensive on how to deploy to DO and Heroku.
• https://github.com/PerfectlySoft/Perfect
• https://github.com/izqui/Taylor

Apple Watch

• JBWatchActivityIndicator - create activity indicator and output each frame

Markdown

• AttributedMarkdown - customise the font style for PARA, EMPH, etc
• MXMarkdownKeyboard - using inputAccessoryView
• GHMarkdownParser - GitHub flavour
• Cocoanetics/DTMarkdownParser
• MMMarkdown - popular, but not yet supporting mmd
• bypass - Render in UITextView (not html)
• /NimbusKit/markdown: NSAttributedString Parser (can use with TTTAttributedLabel)
• Markingbird - In swift

Gestures

• DBPathRecognizer: Recognizer with combinations of 8 strokes. Easily ‘A’, ‘B’, etc.