Wildhoney/Leaflet.FreeDraw

:earth_asia: FreeDraw allows the free-hand drawing of shapes on your Leaflet.js map layer – providing an intuitive and familiar UX for creating geospatial boundaries similar to Zoopla and others. Included out-of-the-box is the concaving of polygons, polygon merging and simplifying, as well as the ability to add edges and modify existing shapes.

JavaScriptMIT