An application for the Macintosh which allows you to switch
resolutions on your multisync monitor without the hassle of changing
the cable that is connected to the built-in video. It is similar to
DPI-on-the-fly and Radius Resolutions, but it is more compatible with
other software (it is an application rather than an INIT/CDEV, and it
doesn?t patch any traps).

DL #1 Monitor Switch v1.0.1
DL #2 Monitor Switch v1.1

Compatibility
Architecture: 68k

Monitor Switch currently works on the Centris and Quadra families of
computers. It should work on any future Macintoshes with similar
built-in video hardware.