7-Zip is open source, meaning it's completely free, even for commercial use. It's only 1MB in size, and can pack and unpack just about any compressed file archive you can throw at it.

WinZip 19 continues to be the industry's leading application to create and unzip Zip and Zipx files and open compressed files including Zip, Zipx, RAR, 7Z and more.

With support for Zip, Zipx, RAR, LHA, 7Z, JAR, and WAR formats, WinZip makes it easy to open any compressed file you receive, no matter which platform it was created on.