About Swift 2.2 (Apple, good introduction, see link a the bottom)

99 Bottles Of Beer - in X Programmiersprachen

OverAPI - Tons of Cheat Cheets

Objective-C Literals

Eclipse-Plug Ins mit Java entwickeln (DE)

Understanding Objective-C Blocks

Short practical guide to blocks in obj-c (Apple)

Das Floating-Point-Problem erklärt (EN)

Blog über Floating-Point-Effekte

c++ .com

C++ FAQ (EN)

IEEE definition of printf format

Objective-C Getting Started

Einführung in Objective-C, Ralf Ebert

Objective-C Einführung bei Apple (EN)

Java Script Guide auf mozilla.org (EN)

C++ reference and more (EN)

C (Galileo Open Book)