

zlib
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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.
Comments and Reviews
As a core library with a minimal command line wrapper available zlib is incredibly useful in handling basic deflate compression for programs and scripts.
It is clearly not a substitute for Archivers such as 7zip, but a good utility to have on your computer, or to utilize in a program you are making, none the less.
Most people have it on their computer and don't even know it's there, because it is used by other applications transparently to handle deflate compression.