2 layers95.6 × 95.5 mm

Panel
ansemjo/pi2co-usb
USB to I2C bridge using an Atmel AVR ATtiny85V and even more tiny than I2C-Tiny-USB.
492 parts4GPL-2.0
KiCad boards from 1 GitHub repository tagged “i2c-tiny-usb”, the most starred first; open any of them in PCBKit.