Hi, the way i understand; you have a computer somewhere that is not connected to the internet, then you want something to just give you all the packages for you to download then install them on the machine with no internet connection. Well maybe not like Ubuntu Software center online look alike but their is this software

[URL="http://keryxproject.org/"]http://keryxproject.org/[/URL]

its an offline repository, you install it to a USB flash drive and where ever you have the chance to get online you choose what software to install and off you go to the machine with no internet, maybe this will help you , not sure if this is what you were looking for.