I have been thinking about moving my writing projects somewhere else, but I don’t know any decent alternatives that would let me format the text properly and such.
Libreoffice is free and open source.https://www.libreoffice.org/
What this guy said, also if you are looking for collaboration, Skiff has this thing called Pages- I don’t know how well it works but might be worth a look
If you want something online and collaborative with basic text formatting there’s Etherpad (https://etherpad.org/). If however you want a full-fledged offline word-processor then there’s LibreOffice Writer (https://www.libreoffice.org/).
https://www.collaboraoffice.com/nextcloud/ sounds like what you’re looking for. I’ve not tried it myself as I actually like the Google docs/sheets etc offering.
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I think the situation here is similar to Telegram. Russian connections, but not in a impactful way. I use both without worries, but if this doesn’t suit somebody, there are alternatives.
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@hungryphrog @nostupidquestions take a look at @nextcloud - collaborative doc editing is sort of workable on it.
owncloud + collabora
As a different, more techy, solution that can work depending on the people you collaborate with, is to use a hosted Git service for collaboration (if you want to stay completely open source, a self-hosted GitLab).
Then, change your publication workflow to write in Markdown, ReST, or one of the other ascii formats that previews correctly, and set up your CI to render the documents automatically into, e.g., pdf:s using a converter. There are all kinds of converters from Markdown/ReST -> docs, presentation, etc. formats that are as competent - if not more so - than the usual office suites. This setup offers both online editing in the GitLab instance and offline by local cloning of the Git repo.
The side effect is that this system very seriously records and preserve your document history. You can see exactly who, at what point, changed, added, and removed things. For some types of documents, this can be very important.
Overleaf.com, but not really, because it’s LaTeX
If you join tilde.team you will get free access to their nextcloud services