How to highlight and annotate PDF and DjVu documents?
13250
How can I highlight or annotate PDFs?
28679
What PDF viewers are available for Ubuntu?
14075
Blacking out a part of a PDF, or redaction of text
99273
Is there any text editor which supports Markdown (Ask Ubuntu's formatting style)?
23435
How can I display syntax highlighting on a file?
4787
How Do I Document Packages in Java?
88783
Parenthesize what I have highlighted
25684
How Can I add HTML And CSS Into PDF
66309
TOC entries and labels for included PDF pages
46873
How to preserve hyperlinks in included PDF?
20510
Macros for code annotations
26057
How to edit pdf metadata from command line?
35311
What are the available "documentclass" types and their uses?
158096
Is there a way to have coloured hyperref hyperlinks in the PDF, but have them print "as if" they were black?
40644
How to generate/view PDF using Lightning Components?
71658
What readers annotate PDFs better than the Preview app?
72505
Automatically highlight undefined references