If you don't see zip and unzip (or unzip-fm, as I think it's now called) in the application manager, with extras and extras-testing enabled, then they're in extras-devel and you should enable it for a moment. Then you can install them in application manager (no red pill needed). Disable extras-devel afterwards. unrar I'm not certain about, but you can always apt-get search it while you have extras-devel enabled.