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Introducing TiddlyPWA: putting TiddlyWiki on modern web app steroids
(val.packett.cool)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
The zero effort way to go would be to start out with a private wiki on tiddlyhost. If you decide you need to go further in self hosting it's easy to do, but you might as well just get started without effort and make sure you enjoy using TW.
My only complaint with tiddlyhost is that when I switch computers it tends to log the old computer out and I have to re-log in.