Drupal
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Drupal is one of the most widely used website servers in the world. It is even used by the US White House .
Drupal site building tips -
If you are running more than one Drupal site, you can simplify management and upgrading of your sites by using the multi-site feature. Multi-site allows you to share a single Drupal installation (including core code, contributed modules, and themes) among several sites.
Run multiple sites from the same code base (multi-site) | drupal.org
reCAPTCHA is an add-on Drupal module designed to work in conjunction with CAPTCHA .
reCAPTCHA - Drupal Module Reviews and Ratings
Mollom - Disqus provides built-in spam protection but I use Mollom to guard the user registration and contact forms which is very effective.
essential modules for your new Drupal 7 site | Blog in isolation
If you are new to drupal, then this list is for you. These are some of the best of the best drupal modules. Everything from standard framework modules, to location and mapping is covered. Note that if you've been emersed in drupal for some time, than this will be "old news". The Big Three "The big three" are important enough that they deserve a category of their own.
40+ Essential Drupal Modules | Nick Lewis: The Blog
Top 10 Essential Drupal 7 modules | Steve Purkiss
Drupal 7 is nearly here! There's lots of modules included over and above what was in version 6, however for me there are some essential Drupal 7 modules I can't do without on any site I build for clients so I thought I would share them.
Many Features Its one of the best modules to make backup i have ever seen in most CMS platforms and fortunately this module is written for Drupal. The good feature of this module is making backups using multiple ways.
Backup and Migrate - Drupal Module Reviews and Ratings
Use Drupal to build everything from personal blogs to enterprise applications. Thousands of add-on modules and designs let you build any site you can imagine. Drupal is free, flexible, robust and constantly being improved by hundreds of thousands of passionate people from all over the world.
Drupal - Open Source CMS | drupal.org
Drupal Backups
Add new pages by using the “Add child page” link at the bottom of the page. Check the Documentation issue queue for new page requests by others.
handbooks | drupal.org
Drupal Auto Update