A federated wiki the focus on fighting Wikipedia from a developer of Lemmy. I don't like their cause, but I'm interested in the technical aspect (I myself had been trying to come up with an excuse for using ActivityPub for wikis for two years). They seem to use WebFinger usernames like that: article@server! Wild! Their treatment of media is unclear to me right now, also they seem to federate Markdown, which is just ridiculous for a Wikipedia killer. Wikipedia uses infoboxes a lot, how are you gonna replace that?

Runs https://alexschroeder.ch

I have been responsible for the MediaWiki installation on https://wiki.openttd.org/ from ~2005 till 2020. One thing became clear: it is very difficult to keep it up-to-date and to find quality extensions that live for more than a few years.

So, we set out to find an alternative. With the experience we have had with for example BaNaNaS we ideally would like to store all the data in git. This is mostly as data in git is easier for more people to maintain, then a database where very few people have access to. Also, the wiki of OpenTTD was not big enough (~5000 pages) to really need a database to support it. As extra bonus, we would favour any system that could easily be cached.

The software closest to this is gollum. Although gollum appears to do exactly what we want, especially as wikitext is supported via WikiCloth, reality turned out to be something else. Although it does support wikitext, or a subset thereof, it does not support templates. This is a huge issue for any real wiki, as templates make a wiki of any decent size possible. Initially we did hack in support for templates, but as it is written in Ruby, not a language any of the people involved knew sufficiently to make any decent contribution, it only added more issues than it resolved. In the end, it was decided this was not a road to go.

A wiki about concatenative programming languages running a custom (looking good) wiki engine with a custom markup!

Wiki engine (what's wiki about it) with threads (cool! I thought of something similar for Mycorrhiza) and whatnot.

Zim is a notepad like desktop application that is inspired by the way people use wikis.

So this is what I learned for Oddµ: The wiki is for single authors
first and foremost. All the wiki features like revisions, diffs,
histories, recent changes – they only matter if you have enthusiastic
collaborators that you don’t know and I haven’t seen that in a very
long time. So that’s why Oddµ lacks all those features. Most people
aren’t going to need them.

Looks rough and barely maintained, but actually there was a new release just recently. You're not gonna information about it on the site though!

An extension that brings XWiki to the Fediverse

A cute small wiki engine. I like the markup: it is Gemtext + HTML + Wikilinks.