Frank Adams used a Teensy to turn an old laptop into a server crash cart.
A popular tool in many server farms, a KVM (Keyboard, Video display, Mouse) or “crash cart” is a diagnostic tool you can wheel up and plug into a crashed rack mount server to figure out what went wrong. Frank converted an old, broken laptop into a KVM by replacing the motherboard with a Teensy and a video converter card.
Frank wrote up a great instructable detailing how to build your own.
Code for the project is available on GitHub.