PDF annotation tools on Linux

What are good PDF annotation tools on Linux? Preferring saving the annotation in the PDF instead of separate files or images.

I find the best solution may be wine + Foxit Reader. Foxit Reader can annotate PDF files and save them. It works very well on wine.

Steps to install them:

Install wine

# yum install wine

Download Foxit Reader and run it by wine installation_file.exe. Download link: http://www.foxitsoftware.com/Secure_PDF_Reader/

The script that I use the open PDF files (use foxitreader pdffile.pdf):

$ cat ~/bin/foxitreader

#!/bin/bash

# echo "$*" > /tmp/foxitreader.tmp

file=$1
# dir=$(dirname "$1")
realpath=$(realpath "$1")
echo $file
# echo $dir
echo $realpath

winepath=${realpath////\}
echo $winepath

wine ~/.wine/drive_c/Program Files/Foxit Software/Foxit Reader/Foxit Reader.exe $winepath