The Mother of All Demos

Douglas Engelbart and his team at SRI demonstrated the NLS (oN-Line System), showcasing a graphical interface with a mouse, hypertext, windows, and real-time collaboration. While not a toolkit itself, it laid fundamental groundwork.

Significance

This monumental demonstration introduced many core concepts of modern interactive computing, proving the viability and power of graphical interaction, which inherently required underlying reusable components for practical implementation.