We don't release a list of our customers unless they previously give us permission to talk about them in public.
If you want some sample apps you can look in the TurboActivate package and play with the sample apps we included. Also see Using TurboActivate.
I am especially interested if anyone is letting the user to Deactivate or how they handle connections behind proxies
Regarding proxies see: Proxies in TurboActivate.
One way we recommend offering deactivation for end-users is to add a menu to your app (like Help -> Deactivate) and call the deactivation from there.