Linux.com published a review on Pessulus, a lockdown manager for the GNOME desktop.

Looking for a way to limit users' functionality on a publicly available machine, such as a kiosk machine for conference attendees? No one wants people trying to alter their systems for fun or malice. If you're running the GNOME environment, you can turn to a tool called Pessulus -- a lockdown manager for the GNOME desktop.

Lock down the GNOME desktop with Pessulus