Kazaa-Its ok but it tends to be stocked with bloody virus also when installed installs its own pop up program that does'nt block them but allows them to come up.Uninstalling this program will get rid of them.
IMesh-This one here is my personal favorite get anything and everything you want of it from full games to full films.This one also builds its own pop-up thing which again creates them
.Same As Kazaa uninstalling the program gets rid of its pop-ups.
WinMX-A very good program but should only be used for music its other options are crap no offense to anybody who uses this program.
Morpheous-I once used this it is very easy to use and is good for music.
Napster-As most of you no this is now been banned and took of most downloading sites.
EMule-This program here is by far the most amazing i have ever ever seen it has everything you will ever ever need my dad and me so far have pulled 2543files of it in the course of 5months.