The dns-sd command is part of the net/mDNSResponder port in FreeBSD. The aforelinked FreshPorts entry shows its origin. It is the net/mDNSResponder package in NetBSD.
None of Debian, OpenSUSE, or Ubuntu appear to package it.
Apple's on-line manual pages for Darwin, where one would have found the dns-sd(1) doco, have been famously gone for years. One can ...
Raspbian is Debian, so you have: apt, apper, etc.
apt is a command line tool. apper is a Graphical User Interface.
Software Centre, is a (Microsoft or Ubuntu) tool, based on Debian's system, but with proprietary intent (malware).
gfortran is free software (part of GCC, the GNU Compiler Collection) and fully implements the Fortran 95 standard and has support for many features of Fortran 2003 and Fortran 2008 standards as well. It's definitely an option you should consider. 1
ifort is actually available on Linux and, in some situations, free of charge. For example, it's free for ...
You can use Foxit Reader, available in Windows, Mac OS, and Linux.
When you create bookmarks in Foxit Reader, they appear as an Index in the common .pdf viewers.
Open the .pdf file with Foxit Reader
Open the Bookmarks NAvigation Panel in Menu Tools > Navigation Panels > Bookmarks
Now you can use the icons to create and name Bookmarks and you can move ...