| ©1993 Origin Systems Inc
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| ©1993 Origin
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| ©1996 Dataware
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| ©1989 Broderbund Software
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| ©1989 Broderbund Software, Inc.
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| ©1992 Opaque Software
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| ©1991 Jim Fox
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| ©1992 Steve Stancliff
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| ©1986 Epyx, Inc.
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| ©1988 TyneSoft
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| ©1989 ShareData, Inc.
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| ©1985 Infocom, Inc.
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| ©1995 Capstone Software
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| ©1985 COMPUTE! Publications, Inc.
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| ©1983 Infocom, Inc.
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| ©1984 Sierra On-Line, Inc.
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| ©1985 Telarium
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| ©1985 Synapse Software Corporation
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| ©1988 Out of the Blue Software
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| ©1987 GO!
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| ©1990 Sir Tech Software Inc
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| ©1987 Sir-tech Software, Inc.
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| ©1987 Sir-tech Software, Inc.
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| ©1988 Sir-tech Software, Inc.
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| ©1987 Sir-tech Software, Inc.
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| ©1988 Sir-tech Software, Inc.
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| ©1981 International PC Owners
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| ©1985 Strategic Simulations, Inc.
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| ©1989 Valueworks
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| ©1988 Rick Nowalk
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| ©1990 Sirtech Software
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| ©1992 Sirtech Software
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| ©1987 Ocean Software Ltd.
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| ©1986 RJ
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| ©1992 Chih-Hung Hsieh
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| ©2004 Wolf Skevos-Jones
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| ©1993 Digital Masters
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| ©2010 Acord Games
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| ©1990 NovaLogic
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| ©2003 Dorothy and Ozma Productions
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| ©1988 Davidson & Associates
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| ©1983 Davidson & Associates
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| ©1988 Philip Allwood
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| ©1992 Apogee Software Ltd
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| ©1986 Software Express-Direct
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