garry's mod
Sandbox physics game created by Garry Newman and developed by Facepunch Studios on PC.
The game was originally a mod for Valve Corporation's Half Life 2, but was made a standalone game in 2006 for Windows. An OS X version was released in 2010, and a Linux version was released in 2013.
The game has no set objective and instead gives the player the freedom to make his/her own maps, add ragdolls to the map, and manipulate the ragdolls.