Pixel Canvas

Pixel Canvas is a pixel paint program by Paul Neave. It wasn't saved on Wayback Machine, and therefore was lost.

Pixel Canvas
According to the colour menu frame source, It allows users to draw the pixel art, while other users does at the same times. You can change the pixel size, brush size and opacity by the numbers.

Trivia

 * It was inspired by many pixel painting multiplayer content, like the late Plastically's digital graffitis.