KGB Archiver: Compress 1GB Into 10MB

KGB Archiver is a file archiver and data compression utility based on the PAQ6 compression algorithm.
Written in Microsoft Visual C++ by Tomasz Pawlak,
KGB Archiver is designed to achieve a very high compression ratio.
As a consequence, the program is relatively memory and CPU intensive.
KGB Archiver is free and open source software released under the terms of the GNU General Public License.

Version 2 beta 2 is available for Microsoft Windows and a command line version of KGB Archiver 1.0 is available for Unix-like operating systems.

KGB Archiver is one of the few applications that works with the PAQ algorithm for making its KGB files.
It has ten levels of compression, from very weak to maximum, a greater variety than that found in most other compression software.

However, at higher compression levels, the time required to compress a file increases significantly.

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System requirements:
The minimum requirements for running KGB Archiver are:
256 MB RAM
1.5 GHz processor
Features

Supports native .kgb files and .zip files
AES-256 encryption
It is able to create self-extracting archives
Unicode is supported in both the user interface and filesystems
Multilanguage support (including Arabic, German, Greek, Japanese, Polish, Portuguese, Serbian, Spanish, and Ukrainian)