(3)Minecraft 1.8-1.21

Servers that use ViaVersion/protocol support so players on many client versions (often 1.8 through current) can join the same server. Usually they run a modern server jar with compatibility plugins, so it’s mostly for broad client access; gameplay often leans toward 1.8-style PvP/minigames with newer blocks/items either limited or behaving differently for older clients.