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2. List of archive formats - Wikipedia

   en.wikipedia.org/wiki/List_of_archive_formats

   An open source, patent- and royalty-free compression format. The compression algorithm is a Burrows–Wheeler transform followed by a move-to-front transform and finally Huffman coding. .F, .?XF [e] Freeze/melt [3] QNX4, Unix-like and DOS: Old compressor for QNX4 OS. The compression algorithm is a modified LZSS, with an adaptive Huffman coding ...

3. PeaZip - Wikipedia

   en.wikipedia.org/wiki/PeaZip

   PeaZip is a free and open-source file manager and file archiver [5] ... This page always uses small font size. Width. ... (royalty-free license from ACE Compression ...

4. 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. It is developed by Igor Pavlov and was first released in 1999.

5. bzip2 - Wikipedia

   en.wikipedia.org/wiki/Bzip2

   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 such as tar for tasks such as handling multiple files, and other tools for encryption, and archive splitting.

6. ZIP (file format) - Wikipedia

   en.wikipedia.org/wiki/ZIP_(file_format)

   ZIP is an archive file format that supports lossless data compression.A ZIP file may contain one or more files or directories that may have been compressed. The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common.

7. Lossless compression - Wikipedia

   en.wikipedia.org/wiki/Lossless_compression

   In fact, if we consider files of length N, if all files were equally probable, then for any lossless compression that reduces the size of some file, the expected length of a compressed file (averaged over all possible files of length N) must necessarily be greater than N. [citation needed] So if we know nothing about the properties of the data ...