You can try a Foundry demo running on the Forge's servers by clicking the screenshot or button below.
Login with the access key forge

Note: In a future update to the Forge, we hope to offer you the ability to spawn a new private demo server to experience Foundry VTT with full Game Master privileges!

If you would like to try Foundry as a GM and explore all of its features including other game systems or modules, try our Explorer Mode which gives a time limited license.

Check out the video below for more details: