Software with Image Conversion

FileToVox converts things that are not voxel models into voxel models: meshes, point clouds, heightmaps, images and Minecraft schematics all become MagicaVoxel files. It runs from the command line, which makes it easy to put in a pipeline.

PixaTool converts images, sprite sheets and video into pixel art, with control over the output resolution, the palette, dithering, outlines and CRT-style effects. It works in batches and from the command line, which makes it useful for putting a whole folder of art through the same treatment.

Pixelmash takes high-resolution artwork - painted, photographed or rendered - and pixelizes it through a stack of layers whose settings stay editable. Change the output resolution or the palette at any point and everything downstream re-renders, which makes it a way to try pixel sizes rather than commit to one.

Playscii edits and animates ASCII art with arbitrary character sets, converts images to text art, and has a mode for building simple games.