PlayOnLinux :

wget -q "http://deb.playonlinux.com/public.gpg" -O- | sudo apt-key add -
sudo wget http://deb.playonlinux.com/playonlinux_precise.list -O /etc/apt/sources.list.d/playonlinux.list
sudo apt-get update
sudo apt-get install playonlinux

Backtrack :

sudo echo deb http://all.repository.backtrack-linux.org/ revolution main microverse non-free testing >> /etc/apt/sources.list
wget -q http://all.repository.backtrack-linux.org/backtrack.gpg -O- | sudo apt-key add -
sudo apt-get update