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This open-source project might be the geekiest tool on my list, but it’s one I use every day.
I have a PC and a Mac side by side on my desk, each with its own dedicated display. Switching between physical keyboards and mice is annoying. With this utility, I don’t need to think about which keyboard or mouse I’m using—I just move the mouse pointer to the edge of the screen and keep going. It effortlessly moves from the PC display to the Mac and back again. The keyboard follows its focus.
I run the Synergy server on Windows and the Synergy client on the Mac, but you can set it up in the other direction if you prefer. The hidden bonus of Synergy is that it also connects the PC and Mac clipboards, so you can copy a block of text or a link on the Mac and paste it into a program on the PC. Or vice versa.
Of course, you can also share between Windows PCs, and you can have an unlimited number of PCs if that strikes your fancy.
This one is always running.