Warning: Use these installers at your own risk. They are known to work on Mac OS X versions 10.4.6 and 10.4.8 on PowerPC and Intel machines. They will not work on OS X 10.3.
(except where noted, more recent packages requring 10.5, etc)
These are all command line utilities. You'll have to use the Terminal application to directly execute them (or use another application or script to execute them).
These installers will install the executables, libraries and/or support files in the /usr/local directory. If you do not have /usr/local/bin in your $PATH variable, you may have to type the full path in Terminal to execute them (e.g. /usr/local/bin/convert input-image.tif output-image.jpg)

ImageMagick

From: http://www.imagemagick.org/
ImageMagick® is a software suite to create, edit, and compose bitmap images. Find out more at the link above.

ImageMagick 6.3.0 installer for Mac OS X 10.4 (tiger).
Warning: If you use this version of ImageMagick with WebGalleryGenerate, you must use WebGalleryGenerate version 0.24 or later.
Notes on ImageMagick installer
Download Installer: ImageMagick-6.3.0.pkg.tar.gz 9.9 MB

nmap

From: http://www.insecure.org/nmap/
Nmap ("Network Mapper") is a free open source utility for network exploration or security auditing. Find out more at the link above.

nmap 4.11 installer for Mac OS X 10.4 (tiger).
Download Installer: nmap-4.11.pkg.tar.gz 608 KB

png2ico

From: http://www.winterdrache.de/freeware/png2ico/
png2ico - PNG to icon converter. Find out more at the link above.

Notes on png2ico
png2ico 2002-12-08 installer for Mac OS X 10.4 (tiger).
Download Installer: png2ico.pkg.tar.gz 160 KB

png2ico 2002-12-08 installer for Intel Mac OS X 10.5 (leopard) or later (tested on 10.6 snow leopard).
Download Installer: png2ico-intel.pkg.tar.gz 74 KB

wget

From: http://www.gnu.org/software/wget/
GNU Wget is a free software package for retrieving files using HTTP, HTTPS and FTP, the most widely-used Internet protocols. Find out more at the link above.
Note: wget installs to /usr/local so unless you have /usr/local/bin in your path, you'll have to use the whole path to run it in the terminal, i.e. /usr/local/bin/wget

wget 1.10.2 installer for Mac OS X 10.4 (tiger).
Download Installer: wget-1.10.2.pkg.tar.gz 212 KB
The above older version requires Rosetta if you have an Intel processor.

The following installer requires an Intel processor and OS X 10.5 or later.
wget-1.12 installer for Mac OS X 10.5 (Leopard) or later (tested on 10.6 Snow Leopard)
Note this wget is built without nls (native language support)
Download Installer: wget-1.12.pkg.tar.gz 270 KB


WebGalleryGenerate
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