This is a web-based customer management solution I designed that can be hosted online or locally hosted
Install MAMP on a mac or XAMPP on Windows machine and copy the files to htdocs folder and everything will work when going to the localhost. Everything can be found on my GitHub Repository.
If you are interested but do not know how to set up I can do it for you for a small fee please email [email protected]. All my software is free under the Apache license we just charge for setup and support.