Processing
Description
Processing is a free, open source programming language that was created with the intent of introducing artists to basic digital graphics, but its simplicity has made it extremely useful for other projects, specifically when utilizing an Arduino/computer interface. It is a simplified version of the C-language.
Availability
Processing is open source software, anyone can download and install it for free on their personal computer.
https://processing.org/download/
Getting Started
Tutorials are available at https://processing.org/tutorials/