Fragmented is described as 'Join others online or play offline in a hostile, alien world. Fragmented casts players on a harsh, alien planet fighting, hunting and crafting to survive'. There are three games similar to Fragmented for Steam, Windows, Linux, Mac and Xbox. The best alternative is Astroneer. Other Fragmented like games are Planet Explorers (Paid) and Planet Nomads (Paid).
Explore and reshape distant worlds! Astroneer is set during a 25th century gold rush where players must explore the frontiers of outer space, risking their lives in harsh environments for the chance of striking it rich.
Planet Explorers is an open world, sandbox RPG set on a distant planet. The year is 2287, and your colony ship has crash landed on the planet Maria. Explore, build and survive the harsh but beautiful new planet.