I used to have several Sharp Zaurus SL-5500s, they were the best of the PDAs, ran GNU Linux and included a HW keyboard.
They even got all open source drivers for it by the end, the holy grail of hardware freedom.
I might even have an OpenZaurus 3.2 full repo out on the net somewhere.
Such a cool device back before web 2.0 ruined http outside of supercomputers.