Leaflet mega post

Styling specific polygons in a feature collection: http://gis.stackexchange.com/questions/116159/how-to-style-specific-polygons-from-a-geojson-with-leaflet

Leaflet with d3: https://bost.ocks.org/mike/leaflet/

Leaflet with geoJSON: http://leafletjs.com/examples/geojson.html

Correct format for exporting geoJSON with QGIS: http://gis.stackexchange.com/questions/61096/how-to-get-correct-format-of-coordinates-for-export-to-geojson-from-qgis

 

Leaflet mega post