Based on our record, GIS Cloud seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Giscloud.com has some options including a plug-in for QGIS and another standalone "Map Viewer" which is $12/month which seem doable. Source: over 2 years ago
PostGIS - Open source spatial database
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