To learn more about Maggie visit - http://www.maggiemaps.com/
To learn more about OSM or get involved check out these links:
https://openstreetmap.us/

https://slack.openstreetmap.us/

https://stateofthemap.us/

https://teachosm.org/

https://www.openstreetmap.org/

And to really help out consider donating to the development of OSM, just go to https://openstreetmap.app.neoncrm.com/forms/individual-donation