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Steam has a built-in feature called . This allows you to share libraries with up to 5 other accounts on 10 different devices.
Let's address the most important question first: Garry's Mod (GMod) is a paid game that you need to purchase on Steam to get the latest updates and full functionality. While it was initially released as a free mod in its very early days (back in 2004), it has long since become a paid standalone title. The game was originally a free mod for Half-Life 2 before evolving into a commercial product that has since become the second-highest-rated game on Steam's Top Rated chart.