Module for prospective vendors

Hi,

There is a client requirement as to store the details of prospective vendors.

Prospective vendors are those who come just for the discussion of their products or services.

These are not registered vendors of the company.

Client want to store the information of these vendors, so whenever it is required, client can use them for the further process.

I want to know, Is there any module to full fill the above requirement.

Thanks in advance