This is a simple tool I created for building 3D islands that can be used in video games. It is still in the early stages.
How it works:
1- A general outline of the desired island is created
2- Hit the build button and an island is created
3- Perlin noise is used to randomly add mountains
Right now it is a very simple tool but I plan on continuing developing it until it can create islands like the one in The Witness. I'm talking only about the terrain, of course.