Abale Zip is a royalty-free, robust and powerful Zip and Unzip component that costs much less than you would expect. It includes all the compression functionality you need in one easy to use ActiveX DLL that you distribute with your applications. The component works perfectly with VB, Delphi, ASP, C++Builder and Visual C++ and offers tons of sample applications to get you started. Looks like you can D/L a trial version, not clear from the web site if it’s crippled in any way. The web site works hard to explain that their component costs half of what you’ll pay for Xceedsoft’s product.

http://www.abale.com