Re: the source .tgz is in a different place
> New location: http://www.gzip.org/zlib
That is incorrect. The zlib in-memory, deflate/inflate compression library is there (or at http://www.zlib.org/), but Zip and UnZip are separate (and older) command-line utilities for processing zipfiles. They live at http://www.info-zip.org/pub/infozip/
(web pages) and ftp://ftp.info-zip.org/pub/infozip/ (files).
Note that UnZip can use zlib, but this is optional.
the source .tgz is in a different place
New location: http://www.gzip.org/zlib
An open, cross-platform journaling program.
A scientific plotting package.