Leaflet
参考：
Leaflet – a JavaScript library for interactive maps [Official]
Leaflet/Leaflet: JavaScript library for mobile-friendly interactive maps – GitHub
入門
参考：
Leaflet 入門 – Leaflet の使い方の記事一覧 | kitanote
Leaflet.Toolbar
参考：
Leaflet/Leaflet.toolbar: Flexible, extensible toolbars for Leaflet maps – GitHub