GerbView with a ODB++ file loaded (the file is included in the installation).
GerbView with demo project loaded (the project is included in the installation).
Screenshot showing GerbView with an active magnifier window.
The magnifier window will display a zoomed in view of the current mouse position.
You may use the markup tools to add elements to a Gerber layer, in this screenshot you can see a QR barcode element being added.
Screenshot showing a project in transparency mode.
Transparency will make sure all layers are visible.