@gedankenstuecke I use https://www.coherentpdf.com/ locally which has an AGPL licence option (used to be non-commercial uses only).

@gedankenstuecke BentoPDF looks promising, but I haven’t tested it yet.

https://www.heise.de/en/news/BentoPDF-1-0-0-Open-Source-PDF-Tool-with-Privacy-Focus-Released-10793260.html

I always was suspicious about the security of StirlingPDF, and I like that BentoPDF seems to run locally in the browser without uploading anything.

(I have no evidence for problems with StirlingPDF, but uploading all your most precious documents to a service that seems to be a bunch of PDF tools bound together by shoe lace does not seem like a good idea to me.)

@gedankenstuecke My PDF workflow tends to include:

1. pdftk or pdfunite at the command line for merging and manipulating files at the page level.

2. LibreOffice Draw for making small edits.

3. Evince and Okular for viewing and annotating.

4. InkScape for extracting content.

I've not used Stirling PDF but probably none of these are a complete alternative.