A program/App for lists

[Mitch Holmes]

I've worked in sales for many companies and always had a program or internal system paid for by my company to keep create lists, contacts, call backs etc.

Now on my own I have created myself a Excel sheet list but it will get intricate and a lot for work for call backs etc.

Does anyone know of a free site/program or app I can use or download for me to create lists?

Thank you