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Google Slides Web Alternative...
(lemmy.zip)
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@Synther Nextcloud offers Nextcloud Office which uses Collabora Online based on LibreOffice. You can manage all sorts of documents, including slides. You can self-host it or sign up with a managed service provider.
OnlyOffice can also be integrated with NextCloud or WordPress or a bunch of other stuff. I believe it can also be used standalone. Personally, I found it's interface much more polished and usable than Collabora, though it's been a couple years since I compared.
@lukecooperatus That's true, OnlyOffice can be used too. However, Nextcloud Office is better integrated with everything else in Nextcloud. Also, OnlyOffice focuses on MS compatibility while Collabora's focus is open standards files. Both will work, depending on what you really want and care about.