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Leaflet.RegularGridCluster
leaflet plugin that implements grid-style visualization and clustering method
If you have only points, you'll have to cluster them. You can either do it on your side (e.g. in QGIS creating a Vector Grid and summarize the values of the points in each cell), or on the client side using a clustering visualization like this or this .
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If you already / Once have your squares with data, then it's only displaying them on a map. QGIS2Web, Openlayers, Mapbox or CARTO can be some ways to start but if you want user interaction you'll probably have to code it yourself. Bokeh can probably be used for that too (Mapping geo data) but you'll probably have less liberty than in JS.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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qgis2web
QGIS plugin to export your project to an OpenLayers or Leaflet webmap. No server-side software required.
If you already / Once have your squares with data, then it's only displaying them on a map. QGIS2Web, Openlayers, Mapbox or CARTO can be some ways to start but if you want user interaction you'll probably have to code it yourself. Bokeh can probably be used for that too (Mapping geo data) but you'll probably have less liberty than in JS.
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- [Remote] Open Source Web Map Developer with Colorado State University / National Park Service