1 - Half-Life: Full SDK 2.2 The Half-Life Full SDK (Software Development Kit) contains all the resources needed to build any type of game imaginable to run as an add-on for Half-Life License: Freeware OS: Windows 98/Me/2000 Size: 74.6 MB
02/17/2018
2 - Valve Hammer Editor 3.5 Valve Hammer Editor - Learn to create brand new maps using Valve's official editing tool: Hammer. Enjoy! License: Freeware OS: Windows 95/98/Me/NT/2000 Size: 598 KB MB