Thanks for mentioning Eternal September [0]! I used their site in the past but had been using http://news.aioe.org [1] up until it went offline [2] possibly due to a disk failure [3], as it seemed more performant than Eternal September. As far as no-cost text-only newsgroup read/write access, I think we are down to Eternal September and possibly the BlueWorld Usenet Farm[4]. Though arguably, if I'm interested in keeping newsgroups alive, perhaps paying for access from a provider such as EasyNews, GigaNews, etc. [5].

[0] https://www.eternal-september.org/

[1] https://web.archive.org/web/20221220194002/http://news.aioe....

[2] https://old.reddit.com/r/usenet/comments/10m9n22/aioe_gone/

[3] https://groups.google.com/g/eternal-september.support/c/Elen...

[4] https://usenet.blueworldhosting.com/

[5] https://commons.wikimedia.org/wiki/File:Usenet_Providers_and...