OpenEMR is an EMR/PM FOSS (free and open-source software) product that has been in existence for a decade or so. This is the latest version of it and it is one that I experiment with to gain knowledge of the system.
To log on use a username of admin and password of pass. The software does not yet have an relevant data, but the forms and so on can be navigated to gain an idea of the system's functionality. Click here to access the log-in screen.