World Machine
A procedural terrain generator using heightfield nodes, erosion, selectors, and multichannel output for large landscapes.
Why use it
Mountains, valleys, and material masks stay adjustable before height and weight maps move into major engines.
Where it fits
Use art, animation, audio, levels, and narrative to make the game easy to read and its world convincing.
What to check
The free edition has resolution and other limits and the app is mainly Windows-focused; generated land still needs gameplay and performance shaping.