Navigator 2D is an advanced grid A* Path Finding method for your 2D games.
Define a new walkable area using a symple 2D polygon editor, create and edit obstacles inside of your map or set zones with penalty and your IA will avoid it if there is another posibility.
You can move obstacles and the path finder method will repath the routes. Adjust resolution of the path AI for small and simple maps, or increase resolution for big areas with a lot of obstacles