There are all kinds of retro stuff that I still love. What is it about Palm OS that you love?
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Mobile app developers, if you haven't read Zen of Palm, I highly recommend this piece of art. You can download the PDF for free. Nothing beats Palm for its simplicity, responsiveness, and (perhaps subjectively) ease of use, even to this day.
I wrote a series of blog posts about it nearly two decades ago, and later translated some parts into English: https://dingyu.me/blog/zen-of-palm-1-preface
EDIT: Disregard, found it: https://archive.org/details/zen-of-palm