Polygon Map Generator for JavaScript
Polygon Map Generator for Javascript is a re-implementation of an ActionScript that was written some years ago, when HTML5 was still at its earlier stages.
What Polygon Map Generator does is that it generates procedural maps with polygons, and rasterizes the generated map to tiles.
It uses a graph structure to form the elevation, roads, and anything that is related to the gameplay of the game. On the other hand, it uses noise functions for coastline shape, river placement, and anything that is not related to the gameplay.
You can try the generator here. Or check the Github Repository here.