Gearcraft is the level editor designed for use with Nightfire, and as such is better suited to level development than the older Hammer 3.5 ie it works for Half-life just need to change the settings to map for HL. This download is not the full Nightfire editing suite (theres a seperate download for that which has everything bundled together) - just a zip archive containing the editor and configuration files. Texture extraction and model extraction/conversion must be done manually for these assets to be visible from within the editor - see Alura & Zoe and the Nightfire Model Decompiler.
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