Linux Repo

Debian 8 Jessie:

deb http://ftp.us.debian.org/debian/  jessie main contrib non-free
deb-src http://ftp.us.debian.org/debian/ jessie main contrib non-free
deb http://security.debian.org/ jessie/updates main contrib
deb-src http://security.debian.org/ jessie/updates main contrib
deb http://http.debian.net/debian jessie-backports main

Debian 7 Wheezy:

deb http://ftp.us.debian.org/debian/ wheezy main contrib non-free
deb-src http://ftp.us.debian.org/debian/ wheezy main contrib non-free
deb http://security.debian.org/ wheezy/updates main contrib non-free
deb-src http://security.debian.org/ wheezy/updates main contrib non-free
deb http://ftp.us.debian.org/debian/ wheezy-updates main contrib
deb-src http://ftp.us.debian.org/debian/ wheezy-updates main contrib
deb http://ftp.de.debian.org/debian wheezy-backports main
deb http://mozilla.debian.net/ jessie-backports iceweasel-release

Kali 2.0 x86:

deb http://http.kali.org/kali sana main non-free contrib
deb http://security.kali.org/kali-security sana/updates main contrib non-free

If there are any key issues, then run the following from commandline:

apt-get install debian-keyring debian-archive-keyring
apt-key update

Fedora 22+

dnf install http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm

How To Query Repo's

Redhat Systems:

Install the following package:

dnf install perl-YUM-RepoQuery