For terrains you may want to take a look at Gaea: https://quadspinner.com/
It's a bit more involved compared to TerraformFX, but it is far more capable and has very attractive pricing. Depends a bit on your needs though. It is probably not worth the learning effort if you just need a somewhat plausible landscape every once in a while.
looks very cool! can we change the width of the lanes. right now they feel a bit wide..
I dunno if you've played it, but i would check out city skylines and their road mods, the devs and community have put A LOT of thought into building roads ๐