jumpapp is a very fast way of switching between applications or application windows, for X11 Linux desktops.
Using jumpapp you can create a single keyboard shortcut that will launch an application if it’s not already running, or focus the application window if it’s already running. If there is more than one application window open, pressing the keyboard shortcut repeatedly cycles through all the application windows.
This way you have frequently used applications one keyboard shortcut away, no matter if they are already running or not, on which workspace they are on, etc.