Weblogs
The BLOG script makes use of Blosxom, a free Perl script which reads text files and displays them as weblogs.
More Info 
Developer: Intelliscript.net
License: Freeware
Operating System: Linux, Unix, Windows
Nucleus is a tool to maintain one or more weblogs.
Developer: nucleuscms.org
License: Freeware
Operating System: any
XOOPS is a dynamic OO (Object Oriented) based open source portal script written in PHP.
Developer: http://www.xoops.org
License: Freeware
Operating System: win, linux, unix, etc
WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability.
Developer: wordpress.org
License: Freeware
Operating System: linux, windows, freebsd, osx, sun
Segue is an open source content management system designed for e-learning that combines the ease of use of course management systems with the flexibility of weblogs for creating various types of sites including course, news, journal, peer review and e-portfolio.
Developer: Gabriel Schine, Alex Chapin, and Adam Franco
License: GNU General Public License (GPL)
Operating System: Platform Independent
Thingamablog is a cross-platform, standalone blogging application that makes authoring and publishing your weblogs almost effortless.
Developer: Thingamablog
License: GNU General Public License (GPL)
Operating System: Platform Independent
Manage data in multiple MySQL or PostgreSQL databases efficiently from the same web interface.
Developer: Nick Efimov
License: Freeware
Operating System: Linux
A free, flexible, elegant, easy-to-use content management system for all kinds of websites, even weblogs.
Developer: Textpattern
License: GNU General Public License (GPL)
Operating System: Linux
eggblog is a free php & mysql package, allowing you to create your own online journal or weblog (blog).
Developer: Egg
License: Freeware
Operating System: linux, windows, freebsd, osx, sun
Elgg is an open source social networking system including customisable profiles / dashboards, blogging, RSS aggregation, podcasting facilities, full internationalisation, LDAP, flexible plugin APIs and more.
Developer: Ben Werdmuller
License: GNU General Public License (GPL)
Operating System: All
This class can be used to generate multiple sitemaps crawling sites.
Developer: Arturs Sosins
License: GNU General Public License (GPL)
Operating System: Not Available
Superclock is a multi-platform compatible very customizable day/date/time script with an attractive beveled border that uses your own custom background image.
Developer: SpriteWorks
License: Freeware
Operating System: Unix/Linux/Windows
Superwin is a multi-platform compatible highly-customizable pop-up window script.
Developer: SpriteWorks.com
License: Freeware
Operating System: Unix/Linux/Windows
NoPeek is a "no-right-click" script (without the prompt/alert) for webmasters wanting a polished, professional look.
Developer: Spriteworks Developments
License: Freeware
Operating System: Linux, Unix, Windows
Multipurpose Publishing Tool:- documentations- Websites- Weblogs.
Developer: Ilkka Huotari
License: Freeware
Operating System: Linux, Windows
Hondos Weblog provides free weblog hosting.
Developer: hondos.org
License: Freeware
Operating System: All