Houdini Procedural City Generator

The developer of the tool has recently rebuilt his asset generating city roads, and it now works much faster and stable. He has also fixed a number of bugs.

The asset allows users to generate city roads with 2-6 lanes, side streets, parkings, sidewalks with grass and borders, traffic lights with road signs, street lights, advertising boards. It works for any number of road intersections, but you should use no more than 5 road intersections.

There's also a building asset that creates skyscrapers and normal buildings generating geometry with correct UVs on all objects, windows and internal geometry included.  

You can learn more and get the toolkit for $124 here.