RePalm
PalmOS was killed by its design mistakes and technical weaknesses.<p>16 bits memory limitation, even at the time that was silly.<p>Armlets? Extremely hard to write simple native code or to port apps and games from other platforms.<p>No file system, a custom and rather slow database instead…<p>But they had tons of documents on how to follow their UI/UX guidelines.<p>Basically, they had no real kernel upon which building an OS, they tried anyway and it was a mess of epic proportions.