RobotBuilder is a Java program and as such should be able to run on any platform that is supported by Java. We have been running RobotBuilder on Mac OS X, Windows, and various versions of Linux successfully.
RobotBuilder is downloaded as part of the WPILib Offline Installer. For more information, see Installing C++ and Java Development Tools for FRC.
Option 1 - Starting RobotBuilder from VS Code
Press Ctrl + Shift + P and type WPILib or click the WPILib logo in the top right to launch the WPILib Command Palette and select Start Tool, then select Robot Builder.
Option 2 - Running RobotBuilder from the script
The install process installs the tools to ~home\frcYYYY\tools (where YYYY is the year and ~home is C:\Users\Public on Windows).
Inside this folder you will find .vbs (Windows) and .py (Mac/Linux) files that you can use to launch each tool. These scripts help launch the tools using the correct JDK and are what you should use to launch the tools.