(There's no video for Just Click yet. Please contribute to MR and add a video now!)
MultiFinder-style switching for System 7:
System 7 provides a dropdown menu with running applications to select from. With MultiFinder you click the icon to cycle programs without a list. This "reverts" System 7 to the latter.
JustClick1.00.sit (4.68 KiB / 4.79 KB)
Version 1.00 / compressed w/ Stuffit
Emulating this? It should run fine under: Basilisk II