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Alternative to Google sheets + forms
(lemdro.id)
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Someone already mentioned ONLYOFFICE, another nice Nextcloud compatible office suite is Collabora Online. In my experience it has the best support with open document formats (.odt, .ods, etc.) since there's LibreOffice at its base.
They also have a (not top notch but still working) open source client for iOS and Android. For the latter they even created a specific F-Droid repo.