Remember King's Quest? I used to love that game.
I'm still on this quest to find the perfect free EHR. I haven't found it yet. If you're going to get a free product, then you may need to tolerate some ads. No ad filtering plug-ins are currently available for the major EHR solutions.
Others that claim to be free are really super-slim versions that only have the "basic" features. They hook you in, and then try to upsell you to a more robust platform.
EHR or EMR. You decide. Will you go with free and deal with the ads?