Draw is a super underappreciated piece of software imo. It's not quite Publisher, not quite Inkskape, but something in between. I'm not sure what people use it for, but I used it in college to make diagrams for all sorts of projects. LibreOffice's equation input is great, too.

That's good to know. I like Inkscape but its page handling still needs a bit more work.

I'd describe Draw's page handling as "intuitive," if not "sophisticated." You won't get Inkscape's most powerful features, but MS Office-like "stupid simplicity" is the result.

My preferred Open-Source-Software for diagrams is draw.io (https://app.diagrams.net/). Works great, locally and online and runs on pretty much any system while offering everything I need and allowing a crazy amount of customisation.

No kidding. I wish I knew that a week ago.

LibreOffice Draw is an excellent and very useful PDF editor. Just make very sure you have all the same fonts!

LibreOffice has pretty cool support for working with PDFs in general. (Tangential) There's a "hybrid PDF" export option in LibreOffice that lets you embed ODF metadata into the PDF file. When you open the exported file in LibreOffice again you get everything back -- dynamic fields, header/footers, custom style sets, etc.

There's an add image option in pdf.js when I use the (modern browser) demo.

Edit: added an image, saved the PDF and it does indeed include the image I added.