It would be nice if you could build a particle to offer a map from openstreetmap.org as google now insists that the API is only available when attached to a credit card. Most of my customers do not want to open a google account for payments, so openstreetmaps is the only solution I am aware of, as an alternative.
I can't use such useful particles as gadgets or google maps. which I really like..
The only functioning module I've found is https://extensions.joomla.org/extension/osmodul/
Hope this inspires you :-)