VoxelShop!

MagicaVoxel is a free lightweight 8-bit voxel editor and path tracing renderer.

Use goxel to create and edit voxel graphics (3D images formed of cubes) using a simple but very intuitive editor interface.

Voxel Builder lets you easily create and edit 3D voxel graphics right in your browser. Simply select a colored block and click to draw. Zoom in and out with the mouse and click and drag to navigate around the 3D canvas.

Qubicle is a professional voxel editor that enables you to easily design charming 3D models with a unique blocky style. Big hits like Crossy Road and Shooty Skies were made with this tool. Qubicle features everything you need to conveniently and quickly create 3D models at an affordable price.

A free voxel editor from Big Bad Wofl.

Slab.js is an online viewer/editor for KV6 models, which are used by the Voxlap voxel game engine.

Slab6 is a voxel editor that Edits, VOX, KV6, and KVX files.