Remnants

"Remnants is a massively multiplayer open-world survival sandbox role-playing game, playable in single-player, co-op, PVE, and PVP modes. Craft weapons and tools, build and drive vehicles, and level up your character's skills to survive against harsh conditions such as radiation, toxic gas, and extreme temperatures. Dynamic base building, weather, weapon attachments, and resource harvesting are among the current features."