This module provides :

openlayers field renderer for geofield using OpenStreetMap (OSM).
a store locator over an openlayers map : datasource is provided by the view module and search_api.
Datasource could be filtered using the facets module.

Requirements :

Geofield
Views rest export
Optionally search_api, facets for search needs
Optionaly whatever that can speedup display (elasticsearch_connector, solr)

Note that it does not require geojson views, but geojson format could be implemented in near future.

Field rendering :

Classic field rendering with markers, size, zoom management :

Store locator : DEMO

Store locator is a drupal block plugin that could be inserted everywhere.
Search filtering can be added (requires search_api) , also facets filtering (requires search_api+facets)

Other features :

Markers popup : its content will be any display renderer of a node (i.e. teaser etc..)
Clusters : if needed, regroups markers into clusters
Initial position & zoom

Roadmap

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* Form field rendering (marker to submit a geofield in a form)

RTBC issues for Openlayers 6

Filters