DeskStitch

DeskStitch is a software KVM for two Windows PCs. Instead of arranging screens by pixels, it reads each monitor's physical size and lays them out on a desk map in millimetres, so a 4K screen next to a 1440p screen line up exactly as they stand on the desk: no dead zones, the cursor lands where it should, and one hand movement covers the same distance on both PCs.

Setup takes five minutes: install on both PCs, type the pairing code shown by one into the other, check the map. The link is encrypted on your local network; nothing leaves it. Keyboard, held keys, clipboard text and images and jump hotkeys follow the cursor.

Free 7-day trial, then a 29 USD one-time license for the PC with the keyboard and mouse; the second PC never needs a key. No account, no subscription, no telemetry.

Limits, stated plainly: Windows only, exactly two PCs, and no file drag and drop between them. The installer is signed, though SmartScreen can still warn until the new certificate earns reputation.