What is hypercard?

HyperCard

HyperCard was an application program and programming tool for Apple Macintosh and Apple IIGS computers that was among the first successful hypermedia systems before the World Wide Web. It combines database capabilities with a graphical, flexible, user-modifiable interface. HyperCard also features HyperTalk, a programming language for manipulating data and the user interface.

Read more about Hypercard.

Some articles on hypercard:

Data Access Language - Servers and Clients
... One of the more common clients for DAM was HyperCard ... The combination of HyperCard and DAL presented a serious challenge to existing vendors who could offer nothing with a GUI ... Apple gave a series of demos of HyperCard/DAL, and soon Oracle Corporation purchased a HyperCard-clone, PLUS from Spinnaker Software, to produce Oracle Card ...
HyperCard - Similar Systems
... products are currently available which offer HyperCard-like functionality HyperNext is a software development system that uses many ideas from ... HyperStudio, one of the first HyperCard clones, is, as of 2009, currently developed and published by Software MacKiev ... LiveCode, published by RunRev, expands greatly on HyperCard's feature set and offers color and a GUI toolkit which can be deployed on many popular platforms (IOS ...
WinPlus
... WinPlus, originally Plus, was a cross-platform clone of the HyperCard application that enabled users to run HyperCard stacks on Apple Macintosh ... by Format Software GmbH (Cologne, Germany) to overcome deficits of Hypercard ... It was released for the Mac in 1989, distributed by Olduvai, aimed at HyperCard power-users ...
SuperCard
... It is inspired by HyperCard, but includes a richer language, a full GUI toolkit, and native color (as opposed to HyperCard's Apple- or third-party-supplied add-ons) ... based on HyperTalk, the language in HyperCard ...
Plug-in (computing) - History
... Very early PC software applications to incorporate plug-in functionality included HyperCard and QuarkXPress on the Macintosh, both released in 1987 ... HyperCard supported a similar facility, but more commonly included the plug-in code in the HyperCard documents (called stacks) themselves ... Thus the HyperCard stack became a self-contained application in its own right, distributable as a single entity that end-users could run without the need for ...