How active is development of Linkding? Seems there hasn’t been a commit in 2 months or so.

While I wouldn’t expose such a service to the internet it’s still a bit worrying with the amount of CVEs coming out. Like these that haven’t been addressed https://github.com/sissbruecker/linkding/issues/1527, https://github.com/sissbruecker/linkding/issues/1518

They get some bonus points for this in their FAQ for sure!

Is there a Readeck twitter account?

There isn’t but you can follow @[email protected] on Mastodon.

Is the a Readeck Discord server?

There isn’t but you can join #readeck:matrix.org on Matrix.