leaflet:
https://leafletjs.com

leaflet-side-by-side:
https://github.com/digidem/leaflet-side-by-side

leaflet.draw:
https://github.com/Leaflet/Leaflet.draw

leaflet.pm:
https://github.com/codeofsumit/leaflet.pm

leaflet.minimap:
https://github.com/Norkart/Leaflet-MiniMap

leaflet.easybutton:
https://github.com/CliffCloud/Leaflet.EasyButton

leaflet.heatmap:
https://github.com/Leaflet/Leaflet.heat

leaflet.markercluster：
https://github.com/Leaflet/Leaflet.markercluster

leaflet.osmbuildings:
https://github.com/kekscom/osmbuildings

echart:
https://github.com/apache/incubator-echarts