phpMyFAQ is a multilingual, completely database-driven FAQ system. It support various database systems and it also offers a content management system with a WYSIWYG editor, an image manager, flexible multi-group and multi-user support, a news system, user tracking, language modules, templates, PDF support, a backup system, Active Directory support, and an easy to use installation script.
The SeaMonkey project is a community effort to develop an all-in-one Internet application suite. It contains an Internet browser, email and newsgroup client with an included Web feed reader, HTML editor, IRC chat, and Web development tools, and is sure to appeal to advanced users, Web developers, and corporate users. It uses much of the Mozilla source code powering such successful siblings as Firefox, Thunderbird, Camino, Sunbird, and Miro.
SEO Profesional Toolbar offers many SEO-related tools in one place. It can display PageRank, S-Rank, and the number of backlinks for visited pages. It stores the history of ranks for selected sites. It can highlight words, links, view the number of words, and more. The history of ranks and back-links is stored in a database, therefore you may watch how your pages evolve in time. All are equipped with beautiful colorful charts. You can view observed domains in the sidebar and check their ranks without even visiting them. The extension also includes a customizable list of handy SEO-related links. All this is packed together with a search tool for enumerating and highlighting words and different types of links.
ff3sudoku is an add-on that features an engine for playing Sudoku puzzles. It can generate random puzzles, but it also detects and imports Sudokus from several Web sites, including websudoku.com, sudokupuzz.com, sudoku.com.au, and others. There is also a stand-alone version working in Firefox 3+ and GoogleChrome.