Some sample code and a tutorial explaining how to use the InfoZip DLLs with VB.

http://www.codeguru.com/vb/gen/vb_graphics/fileformats/article.php/c6743/

Ch zlib Package is Ch interface to zlib. Ch is a C/C++ interpretive freely available from htpp://www.softintegration.com. Ch zlib Package alllows zlib applications with compression and decompression function runs in Ch across platform without compilation. Ch zlib Package includes the source code for building the binding to zlib.

http://chzlib.sourceforge.net/

DynaZIP offers just about everything you’d want to work with Zip files in a Win32 environment.

DataCompression.info user Mike L. had this to say: Creates huge output executables. Features contained in multiple packages are contained in a single package in comparable products. Pricing is very steep compared to comparable products.

http://www.innermedia.com/dz/index.htm

JSPFM supports the standard file operations of creation, editing, copying, moving, deleting, renaming and compression/decompression of files and directories. JSPFM also supports some special file operations specific to certain file types such as transposition and resizing of image type files.

http://jspfilemanager.sourceforge.net/

In this article I present a namespace of managed types that provide a wrapper to some of the standard functionalities exported by ZLib. ZLib is a well known free, general-purpose lossless data-compression library for use on any operating system.

http://codeproject.com/managedcpp/mcppzlibwrapper.asp

Use the zipdiff tool when you need to compare the contents of two zip files. It is equally suited for comparing jar files, EAR files, WAR files or RAR files. Run it standalone or as an Ant task. The tool supports three output formats: plain text, XML, and HTML. zipdiff is written in Java.

Release 0.4 is shipping as of June, 2004.

http://zipdiff.sourceforge.net/

The Heirloom Toolchest includes Open Source cpio and tar implementations running on Linux, Solaris, and Open UNIX. cpio is able to read and write all known Unix cpio archive formats, including proprietary ones, and zip files, including support for the zip64 format.

The most recent update of the project was on June 30, 2004.

http://heirloom.sourceforge.net/

Microsoft .NET Stream-derived objects that wrap ZLib inflate and deflate functions (C++ Mixed Mode implementation)

Version 1.0.1 is shipping as of June, 2004.

http://sourceforge.net/projects/zlibnetwrapper/

This source code shows how to add zip/unzip functionality to your programs. Claim to fame: simplicity and clean packaging.

http://codeproject.com/file/zip_utils.asp

An article that describes MemoryStream based Compression based on SharpZipLib.

Last updated June 21, 2004.

http://codeproject.com/useritems/mscompression.asp

Zipgenius is yet-another-archiver. Supports 21 different compression formats, plus a pretty long list of extras, such as FTP support, email, backup functions, and more. The long list of features might make you expect a price tag, but ZipGenius is in fact free!

Version 5.5.1.440 of ZipGenius is shipping as of June, 2004.

http://www.zipgenius.it/

Does everything you want, and costs a lot less than the two market leaders!

Version 3.0 is shipping as of June, 2004.

http://www.simplyzip.com

There are two programs named SimplyZip. This is the free one from Germany. This program has an awesome list of supported archives formats.

Version 1.1 is shipping as of June, 2004

http://www.dpaehl.de/

Your basic free zip program. Includes the normal archiving functions, plus some search, email, and ftp options as well.

Version 2.5 is shipping as of June, 2004.

http://www.coffeecup.com/zip-wizard/

A free self-extractor bundler, it can take a standard Zip file and convert it into a self-extracting EXE, or take a self-extracting EXE and turn it into a Zip file. Free for non-commercial use, lots of nice new features in the 2.0 release.

Version 2.0 is shipping as of May, 2004.

http://www.skaro.net/zipfusion

PDF documents are commonly used and their content is usually compressed. This article shows a simple C code that can be used to extract plain text from the PDF file.

http://www.codeproject.com/cpp/ExtractPDFText.asp

PKWare has created a couple of new SDKs that allow developers to create and manipulate ZIP files, as well as to take advantage of PKWares new security features.

http://pkware.com/products/developers/

JIMZip is an easy-to-use, yet powerful, zipping and unzipping interface for MacOS X. Using JIMZip you can compress your files with a simple drag to either the JIMZip dock icon, or dragging window. JIMZip is compatible with programs such as: WinZip, PowerArchiver, PKZip, ZipIt, Aladdin Expander, Stuffit DropZip, and more..

Version 1.42 is shipping as of May, 2004.

http://jimzip.webbastille.com/

Everything you wanted to know about UnZip, one of the two great Info-ZIP programs.

UnZIp 5.51 shipped in May, 2004/

http://www.ctan.org/tex-archive/tools/zip/info-zip/UnZip.html

Zipper is a tool for inspecting the contents of a compressed archive and for extracting.

Version 0.7 is shipping as of May, 2004.

http://freshmeat.net/projects/zipper

This project is an attempt to hoist zlib out of the C world and into pure Java land. This allows Java developers to take advantage of a few zlib features that aren’t available in the standard JDK packages. LGPL license.

Version 1.0.5 of Jzlib was shipping as of May, 2004.

http://www.jcraft.com/jzlib/

Libarchive is a programming library that can create and read several different streaming archive formats, including most popular tar variants and the POSIX cpio format. The bsdtar program is an implementation of tar(1) that is built on top of libarchive. It started as a test harness, but is quickly moving toward becoming a candidate system tar for FreeBSD

http://people.freebsd.org/~kientzle/libarchive/

ZipInstaller is a bare-bones application framework for the
programmer who doesn’t want to learn the painful
intricacies of InstallShield or Microsoft’s installer. If
all you need to do is copy some files to a specific folder
and then create a few shortcuts and menu entries, ZipInstaller
is just the guy for you.

Version 1.11 is shipping in May, 2004.

http://freehost14.websamba.com/nirsoft/utils/zipinst.html

A versatile Visual Studio add-in to zip up Visual Studio solutions and projects

http://codeproject.com/useritems/ZipStudio.asp

Yet another free Zip program with the usual cast of features. Supports a pretty good variety of archives, runs under Win32 only, etc.

Filzip 3.0.1 is shipping in May, 2004.

http://www.filzip.com/

This package includes 12Zip and 12Zip2. The first version uses Zip compatible compression, and the second uses a BWT variant.

Version 7.0 of the package is shipping as of May, 2004

http://www.12ghosts.com/ghosts/zip.htm

Microsoft’s implemention of J# includes the standard Java zip classes, and CodeProject contributor Valeri has figured out how to use them from a C# program.

http://codeproject.com/csharp/VmEasyZipUnZip.asp

Links to a variety of lossless coders, includes source for Huffman, arithmetic, LZSS, and other compressors.

http://www.larkin.lanit.ru/compress/compr.htm

AutoZIP Backup is professional software that lets you automate the backup of your precious files to a ZIP archive.

Version 1.0 of this product is shipping as of April, 2004.

http://www.cmfperception.com/autozipbackup.html

WS:Compress Out is a member of Websetters family of Microsoft Office Add-Ins. This Add-In extends the functionality of Microsoft Outlook 2000, 2002 and 2003. Every time you send an email that contains attachments, WS:Compress Out will automatically compress the attachment and resave in the mail item. This reduces the amount of storage used by you in your Outlook storage, reduces the time online and network bandwidth used, reduces the amount of storage used by your recipients - all saving you money.

http://www.websetters.co.uk/WSAddIns/Compress%20Out/index.htm