GAC - Graphic Adventure Creator
An adventure writing system from by Incentive Software Ltd that was quite popular among the 8-bit systems. This page offers the version for ZX Spectrum for download, with or without the quickstart data. The Graphic Adventure Creator
Has the ZX Spectrum version as SNA files. Also scans of the box and manual. C=64 GAC
Manual for the C64 version of GAC. GAC Programming Clinic
Hints and tips regarding adventure writing using GAC for the Amstrad CPC. WhatNow?
An application that can load and play many freely-available text-only and text/graphic adventures on your Z88. It is a complete emulation of Incentive's Graphic Adventure Creator (or GAC) runtime system.