Apollo is a launching utility. You configure a menu containing those applications, control panels, desk accessories, folders and documents you use frequently. Then, whatever you are doing, a click of the mouse pops up the menu and lets you open any of the configured items. You can organise items into groups, with each group having submenu. If a group is made "active", selecting its name makes Apollo open all the items in the group seriatim. Apollo can automatically control the sound level and screen depth for each application, changing them as you switch between applications. It also has facilities for switching between applications using the keyboard.
Mac OS Classic