Using a bunch of analog crosspoint switches wired together into one bigger switch, this breadboard makes real, hardware connections between any points on the board or the Arduino Nano header at the top via software command, instead of needing to use jumper wires.

Jumperless also has a ton of voltage/current sensing so the RGB LEDs underneath each row can show a ton of information about what's going on with your circuit.

It also has DACs and GPIO to simulate signals, so you can virtually route signals over the internet.

Use it to probe the pins on an unknown IC, or for some automated fuzzing, or to help guide you through converting a schematic to a real circuit, or do whatever the hell you want.

This is a complete redesign of BreadWare. A lot has changed on this version, but the general principles still apply.
There's a lot more information about how it works on that project here:
https://hackaday.io/project/180394-breadware