Rapid Environment Editor

You may have not heard about environment variables, an environment variable is a parameter of the OS which determines the way the system will work. One example could be the PATH, which indicates the file system paths where you can launch a process from just typing its name.

Rapid Environment Editor is a free application for Windows specialized in addition, edition and deletion of those variables as well as listing the different system variables in the environment.

It's not difficult to use if you know what you are working on, choose the name and the kind of variable you want to edit and give it a value. You'll automatically see the variable in the list.