#ziplib (SharpZipLib, formerly NZipLib) is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET framework. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET language). The creator of #ziplib put it this way: "I've ported the zip library over to C# because I needed gzip/zip compression and I didn't want to use libzip.dll or something like this. I want all in pure C#."
SharpZipLib was originally ported from the GNU Classpath java.util.zip library for use with SharpDevelop, which needed gzip/zip compression. bzip2 compression and tar archiving were added later due to popular demand.
There is a web site from which You can download the assembly and/or the source code (http://icsharpcode.net/OpenSource/SharpZipLib). A forum is also available at http://community.sharpdevelop.net/forums/12/ShowForum.aspx.
Please see the #ziplib homepage for precompiled downloads, license information, link to the forum (support), release history, samples and more.