JOY-iT Raspberry Pi Controllerboard for RGB-LED Matrix | Elektor
Led Matrix Controller Ws2812 | Ws2812b Dmx Spi Controller | Rgb Led Spi Controller Dmx - Led Strip - Aliexpress
Indoor Outdoor Led Screen Full Color Video Panel Novastar Led Matrix Controller Board Mrv366 Hub75 Full Color Receiving Card - Led Displays - AliExpress
Display Individual Texts, Images and videos on LED matrices with the Raspberry Pi - reichelt Magazin
MAX7219 - 8 x 8 32 mm Red LED Matrix + 4-Wire Serial Controller