AUX is a collection of Cocoa (mainly UIKit) categories with test coverage and no (inter)dependencies.
Category names have a prefix X while category methods start with x_.
Via Cocoapods, add the following source to your Podfile:
source 'https://github.com/appscape/AUX.git'
then add a subspec:
pod 'AUX/Log'
pod 'AUX/NSData'