My homemade Raspberry Pi expansions

I am proud to present my own Raspberry PI extensions.
This is second hardware project in my life.

1. 8 channel DAC expander with eight MCP4725 devices.
   
   
2. 8 channel ADC HAT based on single MCP3008 chip.
   
3. 16 channel PWM expander based on PCA9685 chip.
   
   
4. 8 channel GPIO expander based on PCF8574 chip.
   
   
5. 16 channel GPIO expander based on MCP23017 chip.
   
   
6. I2C1 port replicator with OLED display.
   
   
7. Raspberry Pi 3 with mounted all expansion boards presented above..
   
   
   
8. ..and one software to rule them all..