Avenza is what I’d use for small map companies, nonprofits, or georeferenced maps that are typically free or found online directly. For the latter, Field Maps proved an adequate solution since those are typically overview maps anyway (e.g. the Bears Ears BLM map). The GIS thread I linked has other options as well.

However, there is no equivalent of the Avenza map store for small nonprofits or map companies, and as of this date I don’t know of any alternatives. I suspect many of these nonprofits will find their own solutions. Not sure about the map companies.

As for Gaia, CalTopo works but I don’t like their mobile app as much, and their available map layers leave something to be desired.
Natural Atlas has an amazing base map and a clean UI, but it’s not really built for navigation and I found it lacking in the field. If it worked better with tracks and GPX points, I’d switch on the base map alone.

Tried OnX. Didn’t care for it.

Still looking for a full-time Gaia replacement. It’s starting to remind me of the Microsoft or Adobe suite; also enshittified, but sometimes you hold your nose because you need the toolset.

EDIT – I should review Natural Atlas as, again, if they tweaked their focus it would be a good alternative. But, well, navigation is NOT their focus.

The map store is getting sunsetted, unfortunately, with no new updates to existing maps. That means Avenza-based electronic maps will become less accurate as the years march on.

The bigger problem is that government agencies on all levels, nonprofits, and small map companies that used the Avenza store now need to scramble for another easy way to distribute this information. In some cases, they may even need to redo the maps on some level.

I far prefer Avenza in VT because Gaia is so bad. Another alternative is OnX which you can buy for specific states and lowers the cost of a nationwide premium subscription.