This post combines Google Sheets for point data storage with Maputnik for web map style editing. It offers a workflow to keep web maps updated with data from Google Sheets.

How to Create Always Up-to-Date Web Maps With Data From Google Sheets

geojson.io is a quick, simple tool for creating, viewing, and sharing maps. geojson.io supports GeoJSON in all ways - but also accepts KML, GPX, CSV, GTFS, TopoJSON, and other formats.

geojson.io: A Fast, Simple Editor for Map Data

This article teaches you how to return full GeoJSON FeatureCollection and Feature objects from PostgreSQL/PostGIS queries.

Geojson

How to Create Always Up-to-Date Web Maps With Data From Google Sheets

geojson.io: A Fast, Simple Editor for Map Data

How to Retrieve GeoJSON FeatureCollections and Features With PostGIS Query