Life is Tetris@xyhhx #Tiddlywiki sounds fit (the web page can save itself back to the server if it is on a WebDAV folder). But it can't be edited concurrently (maybe its https://noteself.org variant can). #Etherpad or #Cryptpad or #CodiMD are less like wiki and more like Goggle Docs. This is a user's viewpoint, not a hoster's.
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