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stapler
A small utility making use of the pypdf library to provide a (somewhat) lighter alternative to pdftk
... That happens to be a Python alternative to PDFtk[1]. It’s been kind of abandoned in recent years, though.
Also, in the early times of OLE 2.0 MS Office included a utility called Binder that could put several Office documents in a single file and edit them using a common interface. Nothing came of it.
[1] https://github.com/hellerbarde/stapler
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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It's not LibreOffice, but while revisiting CryptPad (which I thought was a multiplayer notepad like etherpad or codimd, except with an encryption key in the url fragment identifier) I was impressed to see that they're expanding to become an entire office suite. You get a WYSIWYG editor (I'd rather wish for markdown but ok), spreadsheet editor, survey forms, and more which I don't remember, all live like google docs but (as I understand it, I didn't audit it) end to end encrypted between the users. It's a bit sluggish because everything has to happen on the client side, so it's a lot of JavaScript, but after the page loads it works smoothly. You can self host it as well, there's a list of instances somewhere on https://cryptpad.org with the official instance being https://cryptpad.fr
LibreOffice has a ton more features and is way harder to port. Case in point: I was at an open source conference where LibreOffice proudly demo'd their new server version, saying it used mapnik. Me, confused, asked huh why'd you use an OpenStreetMap rendering library? Turns out they basically run the ancient C++ UI on the server and make a VNC-like connection and that map tiles is the easiest or fastest way to load the screen. At least, that's what I remember from that presentation, I haven't looked into that madness further, but that's LibreOffice online...
