Website Authoring

bkmrkconv
Converts Netscape's bookmarks.html file into a series of interconnected HTML pages which can be put online. (Perl)
http://www.bleb.org/software/bkmrkconv/

BlibbleBlobble
Open source programs to create indexes, photo albums, links directories and search engines for the web. (VB) [Windows]
http://www.blibbleblobble.co.uk/Downloads/

Bluefish
A programmer's HTML editor written using GTK, designed to save the experienced webmaster some keystrokes. (C) [GNU/Linux, Unix]
http://bluefish.openoffice.nl/

btn4ws.pl
This script creates a sequence of buttons for web pages. (Perl)
http://www.dittberner.info/index.php?language=en;content=gimp

FormHandler
Flexible, modular PHP mailscript.
http://freshmeat.net/projects/formhandler/

G Cows
Scripting language for web content management.
http://www.g-cows.org

Htmldoc
A document conversion and formatting utility that produces indexed HTML, PDF and PostScript files suitable for printing and on-line viewing. (C++) [GNU/Linux, Unix, Windows]
http://www.easysw.com/htmldoc/

MkGallery
Generates an image gallery with thumbnails for the Internet. All pages are HTML 4.0 and CSS compatible. (Shell script) [GNU/Linux]
http://mkgallery.sourceforge.net

MyEasyMarket
Shopping application for electronic markets (PHP).
http://market.securityorg.net

Open Site Builder Tools
Compiles website from predefined template and content files, generates sitemap, has development log analyzer and smart ftp uploader. (PHP) [OS Independent]
http://osbtools.googlepages.com/

PageJumper
Seamless page redirection, which works well with search engines and with browser's back button. (JavaScript)
http://www.innerpeace.org/pagejumper.shtml

phpMember
Allows you to easily include a membership system into your Web site. (PHP3)
http://www.cybergl.co.id/dev.php?product=phpMember

txt2html
Converts plain text to HTML, supporting headings, lists, simple character markup, and hyperlinking. (Perl)
http://txt2html.sourceforge.net/

Typo3
A system designed to manage form and content of websites. (JavaScript, PHP, Perl)
http://sourceforge.net/projects/typo3/

Webber
An environment for producing and maintaning the contents and metadata of Web pages. (Perl)
http://www.rediris.es/app/webber/index.en.html