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RAR for Mac OS X 3.6 by Alexander Roshal

RAR is a powerful tool which allows you to manage and control archive files. The archive is usually a regular file, which name has a ".rar" suffix.

RAR has the following other editions available: RAR for Linux and RAR for FreeBSD.

Here are some key features of "RAR for Mac OS X":
RAR introdu… 

The Lossless Compression Plugin 1.0 by Bruce Gehre

The Lossless Compression Plugin for REALbasic v3.0 or newer uses lossless compression algorithms (LZRW3-A, LZSS and zlib v1.1.4) to compress binary or text data.

The Lossless Compression Plugin provides additionally routines for the calculation of CRC32 and Adler32 checksums.… 

ALAC 1.0.1 by David Hammerton

Located here is a basic decoder for Apple Lossless Audio Codec files (ALAC). ALAC is a proprietary lossless audio compression scheme. Apple never released any documents on the format.
What I provide here is a C implementation of a decoder, written from reverse engineering the file format. It tur… 

RAR 3.7b1 by RARLAB

RAR is a powerful tool allowing you to manage and control archive files. Console RAR supports archives only in RAR format, which names usually have a ".rar" extension.

Here are some key features of "RAR":
Highly sophisticated, original compression algorithm
Special compression algorithms opti… 

7zX 1.5.3 by Sixty Five, Ltd.

Free File compression utility.

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.
… 

Compress 2.1 by From Concentrate Software

Archive a lot of files? Do you wish you had access to more file compression methods than Apple offers from the Finder but without the price of StuffIt? Enter Compress. Compress is a simple way to decrease file sizes. Not only that, but its free!

Compress gives you support for .tar, .gz, .bz2, and… 

Nuendo DTS Encoder 1.0 by Steinberg

The Nuendo DTS Encoder incorporates the DTS Coherent Acoustics audio compression algorithm. With DTS being one of the world's leading surround formats, it is good to know that encoding Nuendo or Cubase projects to the DTS format is only a few mouse clicks away.

As one of the world’s leading surro… 

Flash Optimizer 1.8 by Eltima Software GmbH

Flash Optimizer is a solution, which reduces SWF files size up to 80% thanks to algorithms of vectors, shapes, morphing, Z-buffer, fonts, and sounds. It manages to optimize the whole SWF, including curves, zero-objects, and ZLib optimization. SWF info button shows you details of Flash movies -- size… 

MegaPEG Pro HD 3.3.2 by Digigami, Inc.

The new Digigami MegaPEG.X product line approaches video compression from a revolutionary new perspective which includes the compressionist, you, as a key aspect of the compression process.

No longer 'in the dark' about how/why your compressed video looks good or bad, MegaPEG.X and its big brothe… 

MacGzip (PPC) 1.1.3 by SPFsoft

MacGzip is a compression tool for compressingfiles in the GZIP format. The program allowsyou to set the compression level and severalother options.

Keep in mind that MacGzip is acompression tool, not an archival tool. Thismeans that while the program can compressindividual files, it cannot compre… 

Digigami MegaPEG.X Pro SD 3.1.6 by Digigami, Inc.

The new Digigami MegaPEG.X product line approaches video compression from a revolutionary new perspective which includes the compressionist, you, as a key aspect of the compression process.

No longer 'in the dark' about how/why your compressed video looks good or bad, MegaPEG.X and its big brothe… 

j2k 1.1 by fnord software

j2k is a free plug-in for reading and writing the JPEG 2 file format, the successor to JPEG.

Also known as JP2, JPEG 2 uses wavelet compression to create small images with less objectionable artifacts than JPEG's DCT compression.

Here are some key features of "j2k":
Alpha transparency
Los… 

MacZip 1.0.7cb1 by Dirk Haase

MacZip is a cross-platform compatible tool and includes both Zip (for compression) and Unzip (for extraction) zip is a compression and file packaging utility for Mac.

zip is a compression and file packaging utility for  Unix,
VMS,  MSDOS, OS/2, Windows NT, Minix, Atari and Macintosh,
Amiga and… 

ProJPEG 5.2.1 by BoxTop Software

With ProJPEG you can create high-quality,small JPEG files. The live, interactive compression quality and file-size preview combined with new JPEG compression optimizations and more advanced control over compression settings make it easy to produces mall, nice-looking JPEG files.… 

Compression scripts for Big Cat 1.0 by Michael Grant

Compression scripts for Big Cat is a pair of AppleScripts, when activated via contextual menu, will create a separate compressed archive for each selected file.

Choose 'Compress-StuffIt' to create .sit files and 'Compress-ZIP' to create .zip files.

Completly freeware.… 

MNG Component 1.0b5 by Tarkvara Design Inc.

MNG Component is a suite of QuickTime components (image compressor/decompressor, graphics importer, movie importer, and movie exporter) for making the MNG format accessible through QuickTime.

MNG files are not particularly widespread, so the main goal is not to support MNG files per se. Rather th… 

Sorenson Squeeze Compression Suite 4.5.3 by Sorenson Media

Sorenson Squeeze 4 Compression Suite is the first full-featured compression application to incorporate High Definition (HD) encoding for a variety of video formats including - MPEG-1, MPEG-2, MPEG-4, QuickTime and RealMedia.

The Suite also compresses the highest-quality video for Macromedia Flas… 

Security Services 1.1.5 by Ambriel Software

Security Services is a security app for file/folder encryption, shredding & compression.

Features:
Full strength AES (Advanced Encryption Standard) & Triple DES encryption / decryption
"Gutmann" file shredding & name mangling
Free Space Shredding
High quality internal compress… 

Compression Engine 2.2.2 by Popwire

Compression Engine is a powerful, high quality media encoder for environments with high requirements on throughput. Harvesting the power and stability of the Unix operating system combined with the best encoding and filtering algorithms gives you the content on time and on budget.

Compression En… 

Primex 2.2 by Freakintosh

Primex is a lightweight program that gives you the ability to search for prime and Fibonacci numbers.

The prime-search algorithm relies on the fact that every non-prime number, can be expressed as the product of smaller prime numbers.

Primex uses a scanning algorithm, that allows it to trace e… 

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