Waterline: Blender add-on

Waterline is a Blender add-on which lets you create water foam around your land objects with a water shader setup in a few clicks. The add-on creates vertex colors where your land objects are overlapping your water plane and uses them in the procedual node setup for the foam and water shader. 

You can set how fast the foam should disappear from the land. Choose between linear and exponential falloff (decay) as well as a falloff factor that determines the falloff per face. You can also determine how far the foam should go out inte the water before the falloff begins.

That only takes a few clicks, after that you can press the "Create nodes" button to get your water shader with foam created for you. You can also use this on multible objects at once. Just select the new land object with the eyedropper tool, click create and adjust to your liking, then click "Reload all" and your other land object now has water foam as well. 

All nodes are organized and tweakable to your own liking. Perhaps change the displacement, the water colors or maybe even put in your own foam texture. Just remember that the "Reload all" and "Delete all" buttons take away your own personal settings so preferably set the vertex colors first.