StarMade 0.18999 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. StarMade for Mac is included in Games. This Mac app was originally produced by Schine, GmbH. We recommend checking the downloaded files with any free antivirus.
From the developer:
StarMade is a voxel-based 3D sandbox space shooter game. You can play in your own universe or on a multiplayer server to create, discover, destroy, customize, and design your own worlds. You will discover and salvage space stations, fight against pirates or opposing factions in multiplayer.
You may want to check out more software for Mac, such as Dodge That Anvil!, Hospital Hustle or AirAssault2Demo, which might be related to StarMade.