Number ONE

Google Webmaster Central - Free tools to maintain a website in a perfect shape and make it feel comfortable on the Web. Use them directly on the site that obviously governs the Web

WordPress - Free and Priceless Open Source blogging software. Perfect for both beginners and professional web designers. The best choice to start with when you want to build a DIY website. The best choice to continue with and build sofisticated websites based on this state-of-the-art CMS (Content Management System)

Mozilla Firefox Browser, Add-ons, Plugins, Extensions, Projects, and more and more - The best ever browsing experience with countless amazing tools for webmasters and internet surfers. To name only Firebug would be enough to get excited with a wealth of development tools at your fingertips. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

Open Source Software for Everyday Use

OpenOffice.org - Office Software Suite - Fed up with Microsoft Office. Download OpenOffice - a perfect and free replacement. It absolutely beats and overperforms MS Word, MS Excel, MS Access and whatever Microsoft sells.

FileZilla - free FTP Solution - You can't avoid using an FTP Client program when dealing with websites. Filezilla makes it so easy, you wouldn't even bother what the FTP is.

Web Tutorials

W3Schools - The largest Web Developer Site on the Web. All Free. - Web Building Tutorials from the Source on HTML, CSS, JavaScript, PHP, and more with references and examples.