FS-plugin for Total/Double Commander. Intended for viewing and editing environment variables of current process (TC), current user and system. Opensource and crossplatform.
You can view and edit variable value by double clicking on it. If you press F3/F4, you will see variable information. Also you can set up custom "Value" column in double commander settings (File View->Columns->Custom columns).
Click "Create New" for new variable. Although quite useless in Linux.