2020-08-16 UTC
# ↩️ For out-of-the-box, maybe @microdotblog, though it's not open source. Beyond that the two that come to mind are WordPress+plugins or @withknown+plugins for syndication.
https://boffosocko.com/2020/08/16/55775250/
https://indieweb.org/POSSE ( twitter.com/_/status/1295049336477192193)