Here’s a dead simple hack that anyone with a soldering iron and some reasonable skills can do. Take a piece of radioshack protoboard, 4 board mount vga ports (salvaged is easiest), and some solid core 80-pin IDE cable and build one of these. They do degrade (dim) the signal by not being as bright since the 75 ohm termination is broken by simply wiring them in parallel, but this is no worse than buying a splitter from monoprice. My use case was wanting one monitor at the main desktop, one at the workbench, and one at the couch but not needing the images to be different since I can only be in one place at a time (for now). This 4-way female connection allows one input and 3 outputs using conventional male-to-male vga cables (none of this male-to-female KVM cable stuff). I tried to do this only populating the data pins to one monitor and just duplicating the RGBHV to the others, but for some reason that didn’t work.
simple VGA splitter