Free gzip software for windows

A Delphi component that adds gzip and gunzip functionality to your own programs. It comes as source-code and is freeware.

7-Zip 9.07 beta brings you a useful and easy-to-use open source software. Most of the source code is under the GNU LGPL 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.

Major Features:

1. High compression ratio in new 7z format with LZMA compression
2. Supported formats:
   • Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
   • Unpacking only: ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, NSIS, RAR, RPM, UDF, WIM, XAR and Z.
3. For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip
4. Strong AES-256 encryption in 7z and ZIP formats
5. Self-extracting capability for 7z format
6. Integration with Windows Shell
7. Powerful File Manager
8. Powerful command line version
9. Plugin for FAR Manager
10. Localizations for 74 languages

Requirements:

• Windows 98/ME/NT/2000/XP/Vista

Muzip is a compression utility that supports many formats: Zip, Tar, GZip, UUE.
Main features:
- All formats are available for reading and writing: you can uncompress but create your own archives too in Zip, Tar, GZip and UUE formats!
- In an add request, you can compress a whole directory without particular files or sub-directories.
- Muzip displays the directories tree as the Explorer, whereas WinZip only has a simple list.
- The files and directories can be manipulated using various functions: you can add, delete, copy, move, rename, and create sub-directories...
- The selected file content is always visible in a preview area, which supports many formats.
- You can list the contents of an archive using various formats: plain text, HTML, CSV...
- Using scripts you can do a complex backup in a single click. With the Windows Task Scheduler you will even be able to do it automatically!
- An exclusive feature: it is possible to build the archive manually and not at each modification. This is very useful when you manipulate very big archives: with other compressors, each time you delete a single file, the whole archive is regenerated, which takes a lot of time. With the manual rebuild, you can make all modifications you want, and apply them at once. Muzip can even automatically switch to manual rebuild when the archive has a big size!
- Creation of very small self-extracting archives: with less than 16 Kb in addition of the Zip archive size, any Windows user can uncompress your archive without specific software.
- Muzip has a complete support of drag and drop: compress, move or copy the files of an archive with a single drag and drop
- Muzip is reachable in the Explorer context menu: you can compress files and folders and uncompress archives without needing to launch Muzip.
- Whereas many archivers only have a basic set of options, Muzip offers extended compression settings. You can compress an entire directory without only certain files, use a separate compression rate according to the files type, and more.

Newzip - a reliable, smart advanced zipcompressor for Windows. NEWZIP is not only free, but it is also easier to use and it has more features than most other archive programs.
Main features:
- Newzip can create ZIP, CAB, JAR, LHA, TAR and GZIP .
- Compatible with WINZIP and PKZIP.
- Creates 16 and 32 Bit ZIPSFX files.
- Password protection and many more.
- Span and Read from Disk.
- Now with convert option: you can convert many archives in CAB, LZH, TAR, GZIP TAR, JAR (JAVASOFT) or ZIP.

WinBZip2 is an small freeware tool for working with files produced by bzip2 utility (usually its files with .bz2 extension) and also create such files.
Main features include the compressing, decompressing and testing the integrity of bzip2 files.
The bzip2 is an command line driven compression utility, similar to gzip, but with more strong compression and more liberal license, also free from patented algorithms and currently popular almost as the gzip. Bzip2 is not archiving utility, i.e. its cant roll up several files together. It simply compress the specified file.
The quote from bzip2 manual: "bzip2 compresses files using the Burrows-Wheeler block-sorting text compression algorithm, and Huffman coding.
Compression is generally considerably better than that achieved by more conventional LZ77/LZ78-based compressors, and approaches the performance of the PPM family of statistical compressors".