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Spinward

Design an O'Neill cylinder colony, then walk through it

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GamesDesign Tools

Spinward is a browser tool for designing O'Neill cylinder space colonies. Pick the cylinder's size and star, paint streets with brushes (grid, radial, hex, old town and more), fill the blocks with buildings, parks, landmarks, rivers and farms, then walk, fly a drone or VTOL, or ride transit through your city. Twelve preset colonies are there to visit, plus a torus mode. Built on three.js and WebGL 2; work is saved in your browser. Building needs a desktop. Free, no sign-up required.