497452 Need Backend to manage website

I need a open source back end for the lead management. I should be able to add, delete, and modify leads and customers information. The forms on the website should be connected with the database. There are different forms on the website so I should be able to differentiate between leads. I need the automation alert process so that I can know when to contact my customers. There should be import export functionality to extract records in excel format. I want some more pages and forms to be added and to be connected with the back end. I will provide the content. Please tell me your availability.