Objective-C

The primary programming language you use when writing software for OS X and iOS

20 Alternatives To Objective-C

C

One of the most widely used programming languages of all time
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CSS

Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g.

Clojure

Clojure is a dynamic, general-purpose programming language, combining the approachability and interactive development of a scripting language with an efficient and robust infrastructure for multithreaded programming.

CoffeeScript

Unfancy JavaScript

Elixir

Dynamic, functional language designed for building scalable and maintainable applications
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Erlang

A programming language used to build massively scalable soft real-time systems with requirements on high availability

HTML5

5th major revision of the core language of the World Wide Web
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Haskell

An advanced purely-functional programming language

Java

A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
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JavaScript

Lightweight, interpreted, object-oriented language with first-class functions

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Text-to-HTML conversion tool/syntax for web writers, by John Gruber

PHP

A popular general-purpose scripting language that is especially suited to web development

Perl

Highly capable, feature-rich programming language with over 26 years of development

Python

Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.

Ruby

A dynamic, interpreted, open source programming language with a focus on simplicity and productivity

Rust

A safe, concurrent, practical language. Rust is blazingly fast and memory-efficient: with no runtime or garbage collector, it can power performance-critical services, run on embedded devices, and easily integrate with other languages.

Scala Lang

Scala is a pure-bred object-oriented language that runs on the JVM

Swift

Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, Linux and z/OS.