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. - http://gac.interface1.net/
GAC Programming Clinic - Hints and tips regarding adventure writing using GAC for the Amstrad CPC. - http://www.stuartwhyte.btinternet.co.uk/BALROG/gac.htm
C=64 GAC - Manual for the C64 version of GAC. - http://www.softwolves.pp.se/idoc/read/advcreator_en