You can try the version 1.2.1 of iTop. This is an online demonstration that allows you to test the iTop application with different types of users:

Full read/write user: click here
 Login: admin
 Password: admin

Read-only user: click here
 Login: operator
 Password: operator

Portal user: this type of user has only access to the end-users portal page. Click here
 Login: portal
 Password: portal