Pixel Art Renderer is a real-time viewport renderer for Blender from Pixel Egg Studio that converts your scene into a pixel art style. It runs in the 3D viewport and offers stylized controls, including a customizable color palette.
Beyond live preview, the add-on can render its result to a still image or to an animation. You can set a custom base file name for image and animation renders, and rendering to image will not overwrite previous results. It also adds an alpha channel to the background color, and supports rendering to multiple viewports that you choose.
Pixel Art Renderer supports Blender 3.0 through 4.5 and is distributed under the GPL license. Version 1.9 fixed rendering that was not working on Blender 4.x. The developer notes that a simple or low poly character with big blocks of color works better with the renderer, and a demo video is available.