A powerful file archiver. JAR is a complex application that can help you compress your files to single archives using state of the art technology. It is fast, powerful, reliable, and has a rich set of features.
JAR has a similar command and option feature set to the PC archiver ARJ, but it is not archive compatible with ARJ.

JAR is a PC file archiver that compresses files into a disk-space-saving archive using state of the art archiver technology. It is fast, powerful, reliable, and has a rich set of features (see below).
JAR has a similar command and option feature set to the PC archiver ARJ, but it is not archive compatible with ARJ. JAR comes in a 16 bit DOS version and a 32 bit Windows version.

JAR is not related to the special ZIP archive scheme (Java ARchive) developed by Sun Microsystems.

The Advantages of JAR:
1. Year 2000 compliance
2. Compatible with DOS or Windows 9x, Me, 2K, XP, and NT
3. Supports long filenames in Windows 9x, Me, 2K, XP, and NT
4. File version management
5. Ranks as one of the best in compression in terms of size reduction of the leading archivers
6. Ability to process and archive more than 50,000 files at a time
7. Ability to store multiple backups in the same archive using incremental compression
8. Support of ANSI style comments
9. MS-DOS international language support for the proper casing of filenames
10. Supports nested response files
11. Archives that can span diskettes
12. Built-in facility to recover files from broken archives
13. Optional long filenames translation into short names when extracting files in DOS

We compared JAR with some of the leading commercial archivers: PKZIP 2.04g, UltraCompressor II Revision 3, RAR 2.00 BETA for Win32. LHA 2.X and ARJ 2.x are not included because their compression size numbers are very similar to those of PKZIP 2.04g.

Archiver / Method / Compression Time / Compressed Size
-----------------------------------------------------
JAR32 / Default / 22s / 914,020 / (100%)
RAR 2.00 beta 3 / Default / solid / 55s 997,418 / (109%)
UC2 rev 3 / Default / 44s / 1,051,516 / (115%)
PKZIP 2.04 / Default / 17s / 1,074,550 /(118%)
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SoftSea Editor's Note: this program is 32bit, it can't run under Windows 7/Vista (64-bit).

The license of this software is Free Trial Software, the price is $45.00, you can free download and get a free trial.