Confluence, GitBook, Fandom, DokuWiki, TiddlyWiki, Wiki.js, Notesnook, UpNote, Scriby, Archivy, Booktype, Publicnote, TakeNote, You Need A Wiki, hello ivy, mdBook, ATWiki, Miraheze, Bundled Notes, TreeNoote, Writerside, XWiki, Twake, Tettra, Dokit, Ema Personal Wiki, Notaku, Indigrid, Widget-Board, SlimWiki, IT Glue, GitJournal, Notea, TiddlyRoam, SimpleNotes, Note Crypt, Doxter, MarkWiki, Teamemo, OneBar, LionWiki, Book Reviews, PopNotes, Note Yourself, Bookplay, NoteLynX Outliner Mindmap Wiki are some alternatives to BookStack.