This modification for Half Life 2 is one of the most open and flexible mods you can probably find for any game. You can also choose to create and host your own Garry's Mod server using a server kit provided to your for GMod game by doing a simple Google search for the information. There are also tens of thousands of players that play on Garry's Mod on a regular basis.
GMod has a dedicated following and thousands of servers to choose from and to play online with your friends. There have been many popular game modes that have been quite successful on Garry's Mod since its launch. These are just a few of the most popular and standard modes that have become quite successful using this Gmod sandbox. The modification for Half Life 2 has been around for quite some time now.
You have the ability to use textures and character models from other games, and make many types of game modes that you can think of using the options that the mod gives you for making your modes and having your players download textures and character models that they can use in your games. Using the already very well made and flexible Half Life 2 engine, Garry's Mod ( Gmod) is a mod for Half-Life 2 that enables players to create just about any type of game mode for the game that they can think of.