Justin.tv is a website created by Justin Kan, Emmett Shear, Michael Seibel and Kyle Vogt in 2007 that allows anyone to broadcast video online. Justin.tv user accounts are called "channels", and users are encouraged to broadcast a wide variety of user-generated live video content, called "broadcasts"
Java is a general-purpose, concurrent, class-based, object-oriented computer programming language that is specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA), meaning that code that runs on one platform does not need to be recompiled to run on another.
An open source license is a copyright license for computer software that allows the source code to be freely, that is by anyone for any purpose, used, modified and shared. This allows end users to review and modify the source code for their own customization, curiosity or troubleshooting needs.