1. TruePNG is one of the most advanced PNG optimizers available. It does the most exhaustive checks for reductions, that lets it to optimize further, even if it uses a less efficient compression algorithm than others tools.

    Source: http://css-ig.net/articles/truepng
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  2. Unzip WinZip, WinRAR, WinAce and many other types of archives as easy as 1-2-3! If you download files from the Internet, BitZipper is what you need to access them.


  3. 7zX is a file archiver with high compression ratio. Compression ratio results are very dependent upon the data used for the tests. Usually 7zX compresses to 7z format 30-70% better than to zip format, and 2-10% better than most of other zip compatible programs.

    Discontinued

    The official website is no longer available. Last version, 1.7.1, released in March 2008, can be still downloaded from MacUpdate.

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  4. GUI compressed file manipulation for Mac, works with most common formats: 7z, ZIP, RAR and others.

    Warning

    It seems Trend Micro is using this app to perform some user data exfiltration. https://twitter.com/privacyis1st/status/1038867958435639296

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    • FreeOpen Source
    • Linux
    • Haiku
    XZ Utils is free general-purpose data compression software with high compression ratio. XZ Utils were written for POSIX-like systems, but also work on some not-so-POSIX systems. XZ Utils are the successor to LZMA Utils.
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  5. The user just has to choose one or more files (up to 1000 items and 1.5Gb at the same time), set the encryption password of his choice, and he can also specify one or more e-mail addresses whom the direct download link will be sent.
  6. With JPEG Resampler you are able to change the resolution and size of JPEG images of a directory in one go and move them into another folder.
    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Blackberry
    zlib is a software library used for data compression. It is an abstraction of the DEFLATE compression algorithm used in gzip file compression program. zlib is also a crucial component of many software platforms including Linux, Mac OS X, and iOS.
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  7. Free RAR Extract Frog is a beautiful decompression tool for RAR-archives that supports spanned archives as well as the extraction of password protected files.
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  8. ICEOWS (formally ArjFolder) is written to make compressing and extracting archived files easy.

    Discontinued

    The program is no longer updated. Last version, 4.20b, released in 2003, can be still downloaded from the official website.

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  9. NXPowerLite file compression software for PDF, Microsoft Office and JPEG files.
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    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Self-Hosted
    SecureZIP® is an enterprise-grade, flexible encryption solution that enables organizations of all kinds to implement persistent data protection while gaining visibility into where files are used, shared, and stored.
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  10. During the command-line era of computing, archiving files involved cryptic commands such as tar -xvf somefile.tar. However, since those days, the masses have come to use computers, and they expect an easy to use system with graphical elements and interaction.

    Discontinued

    The project is no longer maintained since 2013. Last version, 1.2.4, is still downloadable together with its source from GitHub

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  11. RarMachine is a powerful RAR archive manager, surely the simplest and most integrated for Mac OS X. You can use it to compress and extract all Rar files downloaded from the internet or compressed on a PC with the power advantage of your Mac System.

    Discontinued

    Homepage & author not available.

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  12. Put an end to format confusion with a click! ZIP, RAR, TAR, CAB and many more - Ashampoo ZIP opens your files fast and reliably and reassembles multi-part volumes.
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