Depending on what you want to achieve, mupdf and its tools may be an option. Back then I
switched impressive from pdftk to mupdf/mutool. It has python bindings, too.
As for a "swiss army knife" command line utility, qpdf is very versatile if you
don't mind the learning curve. There is a gui "PDF Mix Tool" which is not in
Alternatively, we have pdfbox in Fedora, which is a Java library including tools; and
pdfjam and certainly some more.
If I remember correctly, then the licensing of the iText library which pdftk uses was the
main problem in Fedora land, but I never looked back since switching away from