Seems like several others, my actual development career began on WebOS. In high school, I was intrigued by the idea of a web-based, multitasking capable smartphone and begged my parents to buy me one.
Ultimately I learned a ton and have great stories such as staying up all night re-architecting Weatherman (https://appcatalog.webosarchive.com/showMuseumDetails.php?&a...) because of the popularity (and this was before it was on the WebOS store, at this time it was invite-only so I had to post it on a forum!). Weatherman was just a hack on top of a hack on top of a hack. There was no Canvas API on the device so I had to generate the weather images on a server and then send them to the device, for example.
The highlight for me was winning one of the top spots in the Palm Hot Apps competition for the "free apps" category with Pixi Dust (https://appcatalog.webosarchive.com/showMuseumDetails.php?ca...). The physics weren't accurate by any means, but it was the first time I had seriously used C++ (I think it was, it was so long ago!).
I miss having platforms like these with innovative ideas and small communities. I learned so much by having to hack my way around the limitations of the operating system, and really miss WebOS overall. I think I might still have an old Palm Pre sitting a drawer somewhere.