I am not exactly sure but it maybe they are for private servers. Certainly one variant you install and then purchase server access and they give you the login details.
Oscam emu , it's a softcam ,it's and open oscam , you can add your server and use it as client or server
Supcam (fr channels) , Powercam (FR channels and German Channel (Icam) ,gosatplus , worldcam(spasish channels) , ultracam (fr channel ans other channel) , it's a closed Oscam compiled with a minimum futurs for pays server and can only be used as a client of specific pay server.Mean Powercam (Oscam) can work only with Powercam pay server , SupCam (Oscam) can only work with Suptv pay server.