Trello, Google Docs, Confluence, ClickUp, DokuWiki, TiddlyWiki, Nuclino, HackMD, Zenkit, Walling, Framapad, Google Wave, hackpad, Widget-Board, Notea, Docuie, One folder, EasyDocs, Hive.js, Liveminutes, Skore.io, Brilliance File Organizer, Waybook, Acknow, Canvas Collaborative Notes, DeveloperHub are some alternatives to Documize.