The only ones I think I can be certain of...
http://www.gamefaqs.com/pc/564782-frederik-pohls-gateway
http://www.gamefaqs.com/pc/564783-gateway-ii-homeworld
http://www.gamefaqs.com/pc/564778-eric-the-unready
They're actually damn good text adventures, are abandonware and I want people to play them.
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Essy, Avian Enthusiast