Updated 3/5/2018 (Windows Mobile & XMC10 Portabook page is new!)
Sigmarion 1 running NetBSD a program I inputted in C.
Zaurus
Netwalker
Pocket PC
Windows CE
Handheld PC
Windows Mobile
Handheld PC
XMC10 Portabook
Reddit list of Handheld Pocket Computers