Palm OS and the devices that ran it: Before smartphones, we had PDAs in our pockets, and Palm did them best
I remember my PalmPilot very well. I used its Graffiti handwriting recognition to take many memos and keep my life organised. I'm pretty sure before the PalmPilot I only had fixed ROM organisers which had the standard notes, calendar, contact, etc functionality (like the Sharp ZQ-3200 organiser with 64kB of RAM and a serial link)....
