Packages at Gentoo Linux
Lists new packages and provides changelogs, displays stable and unstable versions of a package and allows searching for packages by name and description.
http://packages.gentoo.org/

The Search Engine for Linux rpm Packages
Die Suchmaschine für Linux rpm und Debian Pakete
http://www.rpmseek.com/

Arcadia WebSite Design
Web site authoring packages, hosting packages and services.
http://www.arcadia-design.co.uk/

Marc Liyanage - Mac OS X Packages
Easy to install packages for OS X; PHP, MySQL, and ImageMagick.
http://www.entropy.ch/software/macosx/

Green Ghost
Green Ghost Web Hosting Co. - A Full Range of Hosting Packages Starting at Only US$9.95
http://www.greenghost.biz/

rpm.livna.org
A repository of add-on packages for Fedora. Contains packages not available from the standard repositories.
http://rpm.livna.org/rlowiki/

Will's Tcl/Tk Page
Featuring the trycatch and expand packages, guides to creating object commands and to success with namespaces and packages.
http://www.wjduquette.com/tcl/

Phillip Lord's Emacs Packages
Mostly additional packages for JDE.
http://homepages.cs.ncl.ac.uk/phillip.lord/emacs.html

Kyocera Corp
Offers industrial IC packaging of optoelectonic packages, MEMS packages as well as ultra high vacuum ceramic products.
http://global.kyocera.com/prdct/semicon/index2.html

Guru's RPM Site
A large collection of compiled software packages. Find packages available for several recent SUSE versions, an apt repository, and YaST source.
http://linux01.gwdg.de/~pbleser/