Contact Organization Software

[Arin Hanohano]

So I am looking for software that I can use to input all of my Buyers contact information in an organized fashion aside from the Excel spreadsheet I have now. I have a squeeze page that takes the information (name, phone, and email) then just notifies me of the information but doesn't organize it or allow me to add other useful information about that buyer that I can recall later so I transfer all of my contacts to a spreadsheet. I know theres something that exists out there but I have not found anything so I thought I'd ask for your help... Thanks!!!