MagicaVoxel - A free lightweight GPU-based voxel art editor and interactive path tracing renderer.
Goxel - Goxel is a simple, but powerful voxel graphic editor with 24-bit color support, unlimited scene...
World Machine - Command powerful tools like erosion and advanced colormaps to create terrain heightmaps, meshes, and textures for your game or 3D scene. Download for Free!
Makers Empire 3D - Voxel editor made to be easy to use.
Terragen - Terragen is a scenery generator, created with the goal of generating photorealistic landscape...
Paint 3D - Paint 3D is a standalone graphic editing solution created by Microsoft.