Available:
Microscopic card based on the ATMega32U4.
Prototypes:
Uno-like card which can source up to 2A on some pins as well as read its current consumption.
Status: not functional
Practically indestructible nano-compatible card with protective functiuons borrowed from the Ruggeduino series.
Status: functional, not finished
Compatible with the pi pico but including serious protective measures like the Ruggeduino series.
Status: functional, not finished