Unzipping substitute for WinZIP?

My trial time for WinZIP has expired and I neither can afford to register nor want to use a bootleg copy.

Is there any good program that just unzips the zips? I mainly use WinRAR for unzipping, but I've come across some "linked" zips that require a password.

Or, does WinRAR support passworded zips if you tweak it?