One thing that unfortunately never got properly announced, is that over time Pocket was slowly open sourced piece-by-piece, mostly as it got rewritten/modernised, as I understand it: https://github.com/Pocket/
I guess the fact that it wasn't a big bang source code dump made it hard to make a moment of it.
(Note: open-source does not necessarily mean that it was optimised for self-hosting, which would've been a lot more work, of course.)
replies(2):