I don't know of any other POP devices. The Hi3516 is very similar but has more IO.
I'd like to get a hold of a full SDK for these devices. That Linux one is missing all of the user space apps. Have you tried changing the software in any of these yet? I'm using tftp and nfsroot to run without writing the flash. But I am missing the rest of user space. I have a clip on 8-SOIC programmer coming in mail. That will let me suck out the contents of the serial flash. Then I will be able to crack the root password on these ESCAM units and see their user space.