Blue Twilight PHP photo gallery has a demo system you can use to play around with the application and get a good feel for how it works.

You can login with the details shown below:

Username: demo@demo.com
Password: demo123

Open the demo photo gallery

To prevent people from breaking the demo, user/group/permissions management and the system configuration functions are disabled, however all other functionality is enabled.

The login details above are reset automatically every 15 minutes.