Use your Raspberry Pi to control 7 segment LED displays and LED matrixes that incorporate the MAX7219 chip. These devices are widely and cheaply available online. You can connect the displays to any 3 of the Raspberry Pi GPIO pins and you can daisy chain
Interfacing with MAX7219 8x8 LED arrays for the Raspberry Pi
Abstraction for the MAX7219 display driver controller
max7219 for raspberry pi with node, by wrapper a really cool python package rm-hull/max7219
Tessel 2 abstraction for the Max7219
A Node-Red node for max7219 8-Digit LED Display