Voxel, a 3D pixel editor in HTML
apps.blois.us
apps.blois.us
Paint on the gray grid to toggle the existence of pixels. You put your mouse where the top face of the pixel goes. Change the color of the pixel to paint by selecting a color from the bottom-right.
Move the gray grid up or down to edit a different layer/level. Pixels above the grid are hidden. To move the grid, drag the slider at the left, click its arrow buttons, or use the mouse wheel.
You can rotate the camera by dragging anywhere in the canvas except for the gray grid.
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So much for the "infinite scalability".
The scalability is available, the dev has just decided not to pay for it.
edit, to answer my own question: it doesn't get wider, it just doesn't shrink into the distance either. It still feels odd not having perspective.