Greg Steiert (@fpgahelper) has shared this Qwiic GPIO expander on Hackaday.io:

QGPIO: Qwiic GPIO expander based on PCF8574

This is a handy general purpose input/output Qwiic board. It provides 8 GPIO each with an LED indicator, and goes to a pin in a dual row 100mil header. The LEDs provides a nice visual output. The second row on the header is grounded, so jumpers can be used to drive the pins low for basic inputs. The 100mil pitch headers are also convenient for connecting to external circuits as well. The interrupt and VCC pins also have their own LEDs and header pins. There are two Qwiic connectors for pass through connections.