4 of 8Image
7-Zip will never win any design awards. In fact, it looks like a throwback to an earlier era, when flat icons roamed the earth.
But this open-source utility does its one job very well—helping you pack and unpack compressed files in just about any format, including ZIP and GZIP, TAR and ARJ, CAB, and DMG files. It also opens standard ISO disk images, Windows virtual hard drive files (VHD) and Windows Imaging Format (WIM) files used for OEM Windows installations.
Oh, and it's just plain faster than Windows Explorer at the core task of unzipping a file.
To recap: Free. Fast. Incredibly versatile. What more could you ask for?