Free file archiver

If you are still stuck with WinZip you better check out this open source file zipping or file archiver tool. 7-Zip has a really high compression ratio - is 2-10 % better than ratio provided by PKZip and WinZip.

Supported formats:
- Only Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
- Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS