Valve Hammer Editor
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Hammer 3.x
Originally having its installation files distributed in retail Half-Life under the name Worldcraft, Valve Hammer Editor 3.x is the official Goldsource mapping tool.
Hammer 4.x
Valve Hammer Editor 4.x, provided as a component of the Source SDK, is the official Source mapping tool. Apart from the construction of level architecture, Valve Hammer Editor 4.x is also heavily involved with creating level events and scripting.