All I want is a card or motherboard with some GPIOs and other pins. I've seen some products that almost get there, but they're something awkward like an ARM SBC

All I want is a card or motherboard with some GPIOs and other pins. I've seen some products that almost get there, but they're something awkward like an ARM SBC stuck on Linux 2.6.x with an embedded Arduino. Memory mapping doesn't matter to me, although it would be cool.