Software available in source code form. Source code and other rights are that usually are reserved for copyright holders are provided under a free software licence that lets people study, improve, change and distribute the software
James Gosling: "I invented Java, one of the most prominent open source software to date! Everyone try and do stuff to it!"

Everyone: Woohooooo! Programming is a blast! We love to tinker with Java!"
by Shmenson January 31, 2012
Get the open source software mug.