What are some alternatives?
When comparing The Unarchiver and WinZip, you can also consider the following products
PeaZip - Free file archiver utility, free Rar files software. Open, extract 7Z ACE CAB RAR TAR ZIP archives, support 180+ formats. Data compression and encryption tool.
WinRAR - WinRAR is a powerful archive manager.
Bandizip - Bandizip : All-In-One Free Zip Archiver. Bandizip is a lightweight, fast and free All-In-One Zip Archiver.
File Roller - File Roller is an archive manager for the GNOME desktop environment.
FreeArc - FreeArc is a free and open source file archiver developed by Bulat Ziganshin.
B1 Free Archiver - Free multi-platform universal archiver. Works on Windows, Mac, Android and Linux platforms.