Not packages and not all applications. Just the applications user installed by himself from whatever source (Software Center, manually added PPA, etc.).
If the above is not possible – a list of all installed applications or at least a GUI which lists the applications so I can take screenshots of it.
I've read a dozen of similar questions and people posting answers usually don't even get close to OP question merit. Please note that my question includes 'user installed'.
It is not currently possible in Ubuntu Linux.
(choosing tijybba's answer as the closest one though)