TURBO ZIP CRACKER
Recovering lost passwords to ZIP archives created with WinZip, PKZip, WinRAR or any other ZIP-compatible software Features - All versions of WinZip and PKZip are supported - Self-Extracting Zip...
http://www.fdrlab.com/files/tzc.zip - 950Kb - Download - Screenshot

CRC32 Static Library
CRC32 Static Library for Microsoft VC++ was produced to make your CRC checking operations quick & easy to implement seamlessly without the need for an external DLL The CRC is a "digital fingerprint" of a file, With CRC32 you can "melt down" a huge 20 MB (or even much bigger) file to have a... zip' command to see that PKZIP’s CRC-32 values of files stored inside the filename. ... The algorithm of CRC32 is exactly the same as that internally used by PKZIP and WinZip; i. ... the CRCs calculated by PKZIP and CRC32 are identical.
http://home.freeuk.net/traction/CRC32LibrayTRIAL.zip - 1Mb - Download

Zip Password Recovery
Zip Password Recovery is software that aids the user to recover lost or forgotten passwords for PKZip, WinZip and Zip files.
http://www.miscsoftware.com/zprd205.exe - 711Kb - Download - Screenshot

CRC32 COM Component
CRC32 COM Component is for ASP, . NET, Cold Fusion, VB, VC++ and other languages. The com component will quickly generate a CRC32 checksum from files or a text string in hex or numeric as the official polynomial used by CRC-32 in PKZip, WinZip and Ethernet.
http://www.traction-software.co.uk/downloads/CRC32Com.zip - 1Mb - Download

Advanced ZIP Password Recovery
A program to recover lost or forgotten passwords for ZIP/PKZip/WinZip archives. Supports the customizable brute-force attack, optimized for speed (about fifteen million passwords per second on modern CPUs); dictionary-based attack, and very fast and effective known-plaintext attack. ... Multilanguage user interface is provided.
http://www.elcomsoft.com/download/azpr.zip - 2Mb - Download - Screenshot

ZFilter
ZFilter is a plug-in indexing filter for Windows servers. It enables them to full-text index the contents of zip archives created with WinZip, PKZIP, or any other compression program that uses the PKWARE compression format. ZFilter is designed for Internet Information Server, SharePoint,...
http://www.4-share.com/content/download/zfilter.exe - 949Kb - Download

ZipPassword
ZipPassword is able to recover lost or forgotten password to pkzip/WinZip archives. Brute-force attack, "smart-force attack" and dictionary search are used to find out the password. ZipPassword features unprecedented search speed: up to 1,000,000,000 that is, up to one billion passwords per minute. ... As of now, it's the world fastest password recovery program, up to 3 times faster than the best competitors software.
http://lastbit.com/zippsw/zippsw.zip - 745Kb - Download - Screenshot

7-Zip
7-Zip is a file archiver with the highest compression ratio. The program supports 7z, ZIP, RAR, CAB, ARJ, LZH, CHM, CPIO, RPM, DEB, GZIP, BZIP2, Z and TAR formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format. Also 7-Zip compresses to ZIP 2-10% better than... 7-Zip has additional powerful command line version and FAR Manager support.
http://prdownloads.sourceforge.net/sevenzip/7z432.exe - 821Kb - Download - Screenshot

PicoZip Recovery Tool
PicoZip Recovery Tool is an easy-to-use program that can help you recover lost or forgotten passwords from password protected Zip files created by compression utilities like PicoZip, WinZip, PKZip, etc. Self-extracting Zip files are also supported. You have a choice of Brute Force or Dictionary... This program is distributed as freeware. ... A 650,000+ words English dictionary is included.
http://www.picozip.com/prt/PicoZipRT.exe - 3Mb - Download - Screenshot

BackUp Maker
With BackUp Maker you get an easy to use and complex backup system at the same time. The application offers several wizards and assistants to support you on defining backup jobs for your personal needs. Back-up your important data in realtime - optionally directly onto CD/DVD, internal and... BackUp Maker creates backup archives in PkZip standard - you can restore all your saved data using well-known Zip tools (e. ... g. ... WinZip, WinACE). ... Create splitted backups for being able to save them onto several smaller volumes.
http://www.backupmaker.com/bkmaker.exe - 2Mb - Download - Screenshot