What standard library to use to provide settings editing to user?

[Oleksandr Gavenko]

I write blogging mode and want to provide ability to users to list and edit
connection settings.

As I use external program to do actual authentication and network jobs so I
don't use Emacs variables for storing settings.

External process send list of parameters and their values. I should show them
to user and return user modifications back to external process.

Every parameter have a name and string value (possibly multi-line).

What libraries or code examples are usable for solving such task?

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Best regards!