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2. 7-Zip - Wikipedia

   en.wikipedia.org/wiki/7-Zip

   7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999. [2] 7-Zip has its own archive format called 7z, but can read and write several others.

3. bzip2 - Wikipedia

   en.wikipedia.org/wiki/Bzip2

   Yes. bzip2 is a free and open-source file compression program that uses the Burrows–Wheeler algorithm. It only compresses single files and is not a file archiver. It relies on separate external utilities for tasks such as handling multiple files, encryption, and archive-splitting. bzip2 was initially released in 1996 by Julian Seward.

4. Data compression - Wikipedia

   en.wikipedia.org/wiki/Data_compression

   Data compression. In information theory, data compression, source coding, [1] or bit-rate reduction is the process of encoding information using fewer bits than the original representation. [2] Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy.

5. PeaZip - Wikipedia

   en.wikipedia.org/wiki/PeaZip

   PeaZip is a free and open-source file manager and file archiver [5] for Microsoft Windows, ReactOS, [6] Linux, [7][8][9] MacOS [10] and BSD [11][12] by Giorgio Tani. It supports its native PEA archive format [13] (supporting compression, multi-volume split, and flexible authenticated encryption and integrity check schemes) and other mainstream ...

6. Category:Free data compression software - Wikipedia

   en.wikipedia.org/wiki/Category:Free_data...

   Free data compression software. This is a category of articles relating to software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy: “ free software ” or “ open source software ”. Typically, this means software which is distributed with a free software license, and whose source code ...

7. Lossless compression - Wikipedia

   en.wikipedia.org/wiki/Lossless_compression

   Lossless compression is a class of data compression that allows the original data to be perfectly reconstructed from the compressed data with no loss of information. Lossless compression is possible because most real-world data exhibits statistical redundancy. [1] By contrast, lossy compression permits reconstruction only of an approximation of ...