zlib is described as 'Software library used for data compression. It 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' and is a File Compressor in the file management category. There are more than 10 alternatives to zlib for a variety of platforms, including Windows, Linux, Mac, BSD and PortableApps.com apps. The best zlib alternative is 7-Zip, which is both free and Open Source. Other great apps like zlib are gzip, 7-Zip ZS, Rapidgzip and XZ Utils.