I use okular on gnome when I absolutely need to annotate the PDF, I could not find other alternatives. okular is heavy and slow but it gets the job done when it

I use okular on gnome when I absolutely need to annotate the PDF, I could not find other alternatives. okular is heavy and slow but it gets the job done when it's needed. I hope calibre can support annotations one day for the file formats it supports. 99% of the time I use evince to read PDFs though.