Garry's Mod

Garry's Mod (commonly abbreviated as GMod and typecased as garry's mod), is a sandbox physics game created by Garry Newman, and later by his company, Facepunch Studios for Microsoft Windows and OS X. Garry's Mod was originally a mod for Valve's Half-Life 2, but was later made into a standalone release in 2006.

System Requirements: 

Minimum system requirements:			Recommended system requirements:
CPU: 1.7 GHz Processor			CPU: Pentium 4 processor (3.0GHz, or better)
RAM: http://gamesystemrequirements.com/ 512MB RAM			RAM: http://gamesystemrequirements.com/ 1GB RAM
GPU: DirectX® 8.1 level Graphics Card (Requires support for SSE)			GPU: DirectX® 9 level Graphics Card
DX: DirectX® 8.1			DX: DirectX® 9
OS: http://gamesystemrequirements.com/ Windows® Vista/XP/2000			OS: http://gamesystemrequirements.com/ Windows® Vista/XP/2000

HDD: 150 MB		HDD: 150 MB
Network: Internet Connection		Network: Internet Connection

uTorrent Download: http://www.utorrent.com/

Torrent 1: https://torcache.net/torrent/CCFA4546100808BA7407BC9BEA91DCB6532C9D61.torrent?title=[kat.cr]garry.39.s.mod.additional.content.pack.full.final

Garry's Mod trailer: 

Screenshots: