I'm self hosting Readeck (https://readeck.org/en/) and I really like it. It's nicer than Pocket was, the website extraction seems to work better, and it can't ever be shut down.

For my Kobo, I wrote a mod that lets me redirect Pocket API requests, and a small proxy server that translates Pocket API calls into Readeck calls.

So far it's working flawlessly and my Kobo is using its built in Pocket viewer for Readeck instead. I'm hoping to open source it soon so others can use it.