http://sourceforge.net/projects/sevenzip/
http://www.7-zip.org/

Oops. I forgot to loggin. Btw, the 7-zip program isnt graphically as nice as winrar in my personal opinion but maybe it could be more usefull for you..

bleh 7 zip?! what kind of name is that? blah just use gzip it self isnt that
graphical but its batter than that 7 zip app

http://vick.pcplayground.com/gzip/gzip124xN.zip.gz

Just open command prompt cd to the dir with gzip in it, copy the file you want to gzip to that dir and than do gzip --best fileHere :)

it can gzip zip files so that might solve your archive problem

Some opensource projects have the strangest names.

try http://www.gzip.org/ they have a bunch of links(im too lazy to look through them all).