HyperCard had an extremely shallow initial learning curve. You could walk a non-programmer through building a recipe stack in an hour or so. After you defined a recipe card by dragging fields on to a blank card, then adding some static text labels, you would have a working system. Then you could improve it by adding buttons and writing scripts for each button. The scripting language was very clunky and kind of slow, but it all ran on a machine with about the same specs as a PalmPilot Pro.

Huh. Wikipedia says that Ward Cunningham was thinking about a HyperCard system when he built the first wiki.