Some of the libraries that I use frequently

AFDateHelper

A must have date helper for Swift

Alamofire

Undoubtedly the most popular Networking library for Swift

R.swift

Get strong typed, autocompleted resources like images, fonts, colors, localized strings, reusable cells and segues.

SwiftyJSON

More readable JSON code

SwiftyUserDefaults

Type safe User defaults

XCGLogger

Logging library

LayoutKit

Autolayout library by Linkedin.

SnapKit

DSL to make autolayout easy on iOS and macOS

Gecco

Simply highlight items for your tutorial walkthrough, written in Swift

SwiftyAttributes

Swift extensions that make it a breeze to work with attributed strings.

RazzleDazzle

Add scrollview-powered animations to the app intro of your iOS app