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SharpZipLib
SharpZipLib is a free, open-source compression library for .NET. It supports Zip, Gzip, Tar, and Bzip2, and also computes checksums. The library currently lacks Zip file splitting/spanning, customizable self-extracting Zip files, and reading and writing directly to memory. It is ported from the GNU Classpath Zip library for Java. The library and source code is distributed under the GNU General Public License, with an exception.
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Polar Zip Component
Polar Zip Component is a complete compression solution for any Windows application. It includes standard Zip/Unzip functions, a Self-Extractor Module and Streaming Compression Library in one product enhanced with FULL source code at no extra cost. Full source code comes with the DLL/COM and .NET offering you freedom to customize your ideal ZIP solution. We literally give you the tools to get creative about compressing and decompressing data.
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Xceed Streaming Compression
Xceed Streaming Compression Library is a high-performance "raw" compression library. It offers the ability to compress and decompress streaming data, buffers, strings or single files and supports multiple compressed data formats. Unlike Xceed Zip Compression Library, this ultra light library doesn't offer Zip file handling capabilities.
The library offers 2 well-known compression algorithms: the Deflate algorithm or the BZip2 algorithm.
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PowerArc
High efficient Data Compression Library for use with Delphi, C++ or VB. Support Rank, ZIP, BZIP and PPM compression algorithms. Compression ratio more than 1.5-2 times better than ZIP/RAR archiver. Compression speed up to 8 Mb/sec (on PIII-600).
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.netshrink
.netshrink is an executable compressor for managed files. It uses LZMA compression library and can decrease your file size by 50%. It can also protect your files with a password. .netshrink uses LZMA compression library to achieve maximum compression ratios. Password protection uses verification based on SHA256 hash function and 256 bit AES / Rijndael encryption.
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Xceed Encryption Library
Xceed Encryption Library lets Windows apps encrypt/decrypt data using latest industry standard strong encryption algorithms. Supports traditional secret-key encryption & public-key encryption, and can encrypt/decrypt memory buffers, strings, blobs, streaming data or files. Supports AES (US Advanced Encryption Standard) symmetric encryption algorithm (Rijndael) and Twofish, the runner-up for AES. Also offers RSA algorithm with unlimited key sizes.
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Infima Jpeg Optimization SDK
The technology that lies behind Infima Jpeg Optimization allows Infima to recompress and optimize JPEG files by an average of 30% without causing any addition loss in image quality. Infima Jpeg Optimization SDK introduces a new method for preprocessing and optimizing JPEG images before they are compressed without causing any loss in image quality which allows Infima to recompress JPEG files by an average of 30%
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zlib
Zlib is a free general-purpose data-compression library. Integrity checks performed with the CRC-32 or the ADLER 32 checksums. In-memory operations use the zlib compressed data format (RFC 1950). Deflate (RFC 1951) is used for its compression algorithm. Typical compression ratios are between 2:1 and 5:1. The gzip format, RFC 1952, is supported for compressing files on a file system. Lacks support for PKZip 4.5, BZip2, and Deflate64.
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Xceed Zip Compression Library
High-performance Zip & Unzip data compression library. Lets your applications create and manipulate 100% PKZip 2.04g and 4.5 compatible Zip files and compress/uncompress data directly in memory. Offers maximum flexibility and is the easiest to use product of its kind. State-of-the-art, clearly documented ActiveX component that provides the industry's most complete feature set and the fastest multi-threaded compression engine.
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HS Compress C Source Library
HS Compress is a software library (supplied with full C source code) which provides a programmer with a lossless compression / decompression algorithm based on RLE (runtime length encoding) The library may be used in telecommunications application or for fixed data compression.
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ZipForge
Fast ZIP compression library. ZipForge Personal is free for personal use. No DLLs, SFX, repair, encryption, Zip64, splitting and multi-spanning support
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Infima Jpeg Compression SDK
The technology that lies behind Infima Image compression allows Infima to re-compress JPEG files by an average of nearly 20% without causing any addition loss in image quality (Bit to Bit reproduction). Infima Image compression SDK introduces a new method for preprocessing JPEG, PGM, TIFF images before they are compressed.
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Xceed Zip for .NET
Xceed Zip for .NET is a 100% managed data compression and all-purpose file manipulation class library for .NET. It provides flexible zip, unzip, streaming compression, split and spanned zip as well as the ability to create customized self-extracting zip files. It works with an innovative filesystem object model that makes zip files as easy to work with as regular files and folders.
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Polar Component Suite
Polar Component Suite includes Polar Zip Component, Polar Draw Component, Polar Crypto Component and Polar SpellChecker Component with full source code, written in MS Visual C++ for each of them offering you unlimited freedom in customizing your ideal solution. You will find such an extra value with no other components! Trial version of this product is also available so you can download it to evalute Polar components before purchasing Suite.
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ZLIB.NET
100% managed version of ZLIB compression library. Full C# source code is included. Free for use in commercial software with closed source code, BSD style license.
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