Dropchop is a browser based GIS built alongside Mapbox as well as Turf.js. It allows you lot to perform quite sophisticated spatial queries on mapped information without a server as well as inward your selection of cyberspace browser.
Dropchop allows you lot to upload information from your computer, from a URL or fifty-fifty from Overpass Turbo (OpenStreetMap POI's etc) as well as to perform quite sophisticated spatial queries. The best means to abide by out what is possible alongside Dropchop is to play alongside it. If you lot don't bring whatever map information to mitt thence you lot tin purpose the in-built Overpass Turbo sorcerer to select handgrip of some information from OpenStreetMap.
For representative you lot could purpose the Overpass Turbo alternative (using the bill of fare to left of the screen) to upload all the bars mapped on OpenStreetMap inward the electrical current map view. This is real unproblematic every bit 'bars' is the default setting inward the in-built Overpass Turbo wizard.
Once all the bars bring loaded on the map you lot tin thence perform a let on of spatial queries on your bar data. All the queries that are possible are highlighted inward the map sidebar. The screenshot inward a higher house shows bars inward East London alongside a buffer of five miles or thence all the mapped bars. Loading the bar information as well as performing the buffer took me nearly xx seconds.
Once you lot bring performed the required GIS operations on your mapped information you lot tin download the results every bit a GeoJSON file or every bit a shapefile.
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