Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Visuino - Visuino is a visual programming environment that lets you write programs from Arduino circuit boards.
Rust - A safe, concurrent, practical language
Visual Micro - Arduino IDE for Visual Studio and Atmel Studio
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
Modkit - Modkit is an open-source programming platform that allows programmers with a variety of backgrounds to share their creations and learn from each other and is allowing programmers to make beautiful software.