Mods introducing new content into the game.
Craft and plant (blue-printable) tree saplings that grow into trees, and automate it with the Recursive Blueprints mod.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
Placeable Factorio logo like in the Gameplay Trailer. Made by R3CONN3R, updated for Factorio versions 0.15 till 0.17
Small changes concerning balance, gameplay, or graphics.