I learned C on QNX (back then, it booted from a floppy on a PC/XT). It was a nice little Unix-like OS, with all the things you'd expect from a nice little Unix-like OS, plus a reputation of being rock-solid like nothing else.
I think it's a real shame Blackberry didn't manage to etch a third (or fourth - I also loved Palm's WebOS) niche for their QNX-based phones. Blackbberry 10 was an amazing mobile OS.
100% this. I had a Passport and it was one of the single lovelist phones I've ever had.
Compared to my Nokia 7710, the last device with the original Psion UI... that was an elegant touchscreen, plus physical buttons, and a replaceable battery, but that was about it.
Compared to my Nokia E90 Communicator...
The keyboard was even better; it charged off a standard MicroUSB port, and had a standard headphone jack; it had way more apps, because it ran Android ones pretty well.
Compared to any Android phone... Vastly unrecognisably better messaging app, with one inbox for all messages and notifications. Square screen so no fighting portrait vs. landscape. Physical keyboard for much more accurate typing -- and scrolling. Google-free.
I think it's a real shame Blackberry didn't manage to etch a third (or fourth - I also loved Palm's WebOS) niche for their QNX-based phones. Blackbberry 10 was an amazing mobile OS.