Developed and released by Oracle, the freeware has been specifically created for Java content. To run apps written in the Java programming language, people need to have the app version installed on their computer. Layered on top of operating systems, the JRE runs Java applications by supplying the class libraries and environment. It is compatible with Apple Mac, Linux, and Microsoft Windows electronics on both 32-bit and 64-bit operating systems. Java Runtime Environment is a free program that lets people run Java computer software on their devices.