HyperCard was an application program created by Bill Atkinson for Apple Computer, Inc. that was among the first successful hypermedia systems before the World Wide Web. It combined database capabilities with a graphical, flexible, user-modifiable interface. HyperCard also featured HyperTalk, written by Dan Winkler, a powerful and easy-to-learn programming language for manipulating data and the user interface. HyperCard users often employed it as a programming system for Rapid Application Development of different kinds of applications, database and otherwise.
HyperCard was originally released with System Software 6 in 1987 and was finally withdrawn from sale in March 2004, although by then it had not been updated for many years. HyperCard runs natively only in Mac OS versions 9 or earlier, but it can still be used in Mac OS X's Classic mode on non-Intel based machines (G5 and earlier). The last functional native HyperCard authoring environment is Classic mode in Mac OS X 10.4 (Tiger) on non-Intel based machines (although it can be run on modern Intel-based machines via an emulation layer such as SheepShaver and Basilisk (in this version. Older versions run well on Mini vMac, too).
More Informations about HyperCard can be found at http://en.wikipedia.org/wiki/HyperCard