The SV431DD2DUA 4-port Dual DVI USB KVM Switch allows up to four PCs, each with dual DVI video outputs, to share two monitors, one microphone and set of speakers, one keyboard and one mouse as well as two other USB peripherals.
StarTech.com 4-Port USB 3.0 Hub with Built-in Cable - SuperSpeed Laptop USB Hub - Portable USB Splitter - Mini USB Hub (ST4300PBU3) - hub - 4 ports