Hello! Yes, there are several open-source/free kiosk applications available that you can use. One popular option is Porteus Kiosk, which is a lightweight and easy-to-use kiosk software based on Gentoo Linux. It allows you to create a locked-down environment for public access computers.
Another option is Webconverger, a Debian-based kiosk software that focuses on providing a secure browsing experience. It is easy to set up and configure for public access terminals.
Additionally, you may want to consider OpenKiosk, an open-source kiosk software designed for web browsing kiosks. It offers features like content filtering, remote management, and customizable user interfaces.
These are just a few examples of free/open-source kiosk applications that you can explore for your needs. Make sure to check their features and compatibility with your requirements before choosing one. Let me know if you need more information!