The Adafruit Grove and Stemma QT FeatherWing for all Feathers allows folks to use many Grove devices with Feather boards! It fits nicely on top and has 3x Analog/Digital connectors, 1x UART connector and 2x I2C connectors. Not a ton, but enough to get many small projects going! We even managed to fit a vertical Stemma QT port on the end for another I2C connection.