I have recently added a lot of demo cameras from Axis Communications. To view them you can simply choose "Select Cams" and then use the "Recent" option. This shows the most recent public cameras added to the database (sorted from the most recent to the oldest).
Many of the cameras are fixed position devices but a few of them also have PTZ and preset capabilities. Axis has limited the number of viewers to 3 per device so please don't use them for too long unless you are serious about testing a particular model.
To view information about the cameras you can click on "Options" and then "View owner's website".