Factorio Standard Library [0.17 - 1.1]
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Allows sending of signals from anywhere to anywhere, even between planets. Unlimited distances. No surface restrictions.
Prettier heat glow for heatpipes.
Modifies underground belts and pipes to show their max range when placing them. There's an option to show the indicator when hovering over built entities as well, not only when placing.
A Shortcut Button to regenerate a world surface. You can access shortcuts using the tiny button to the right of your quickbar.