7-Zip

7-Zip is a file archiver with a high compression ratio
Homepage:	http://www.7-zip.org/
License:	7-Zip is open source software. Most of the source code is under the GNU LPGL license. You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-zip [1].
Platforms:	7-zip can be utilized on multiple platforms including Windows 7, Vista, XP, 2008, 2003, 2000, NT, ME, and 98 [2].
Appears in COW:	Appraise email and other large, unstructured text collections, LAC Pre-Ingest Workflow, Workflow for ingesting digitized books into a digital archive

Description

7-Zip is a file archiver with a high compression ratio. You can use 7-zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-zip. 7-zip works for Windows 7, Vista, XP, 2008, 2003, 2000, NT, ME, and 98. And there is a port of the command line version to Linux/Unix. Most of the source code is under the GNU LGPL license. The unRar code is under a mixed license with GNU LGPL + unRAR restrictions. Check the license for details [3]

Platform

7-zip can be utilized on multiple platforms including Windows 7, Vista, XP, 2008, 2003, 2000, NT, ME, and 98 [4]

User Experiences

7zip can also be used to open an ISO Image File[5].