Abandonware DOS title

The most popular Engine: Z-machine games

The Z-machine was developed by Infocom and used in its interactive fiction games. Z-machine is a virtual machine that allows a developer to easily develop text-adventures for multiple platforms without much hassle. A number of interpreters exists so you can play both old and new text adventures on dead platforms as well as recent ones: Glulx, Inform, TADS, etc.
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Bureaucracy

DOSMac OS19873.9/5 Infocom
Bureaucracy is an abandoned text-adventure game designed by Douglas Adams (yes, the writer of The Hitchhiker Guide of the Galaxy), developed and published by Infocom in 1987. Bureaucracy is a peculiar interactive fiction; the game challenges you to solve frustrating bureaucratic problems in a world populated by strange characters.
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Suspect

DOS19844.2/5 Infocom