Using a bunch of analog crosspoint switches wired together into one bigger switch, Jumperless makes real, fully analog hardware connections between any points on the board or the Arduino Nano header at the top via serial, 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 has 2 buffered DACs (0-5V and ±8V), 4 buffered 12-bit ADCs (3 are 0-5V and 1 for ±8V), 2 INA219 current/voltage sensor ICs, and 5 GPIO that can be routed to anywhere on the breadboard or the Nano header. Use it to probe the pins on an unknown IC, or for some automated fuzzing, or to read/write EEPROM chips, or to help guide you through converting a schematic to a real circuit, or do whatever the hell you want with it.