3D-Coat, 3D Pixel Artist, VoxelShop, VoxEdit, MagicaVoxel, Avoyd, Kv6ToSchematic, Acropora, Qubicle Voxel Editor, 3D Slash, VoxelMaker, Voxel Builder, SpriteStack, Cubik Studio, Voxelator, Project Vox, SpritePile, Curious Blocks, Slab6 are some alternatives to Goxel.