WYSIWYG (a.k.a HTML Editor) has become a De facto for quickly formatting and publishing contents from dynamic site like Drupal. This is certainly a time saver and prevents from getting hands dirty with HTML.
In this connection, CKEditor has been a pioneer and around in use and development cycle for a decade (first release was on March 2003, in the name FCKeditor).
Simplenews is one of the solid Newsletter management modules for Drupal. It allows a Drupal site to have multiple newsletters at once, nodes can be sent out as newsletter to multiple recipients on a single cron run. It plays well with HTML emails as well with Editors like WYSIWYG, Drupal mail system and other contrib modules like Mime Mail. Besides these, it allows to have specific sender name and email address per newsletter.
Creating Vertical tabs in Drupal 7 forms is an easy task, but to accommodate the design needs we at times have to use different style. For instance, horizontal tab might be needed. The same makes more sense for shopping cart check out like pages. And here the need for looking solutions outside the Drupal core arises as horizontal tabs are not readily available in core.
Once the installation of a Drupal instance is done, I guess almost 90% of the developers would first download "What You See Is What You Get". Inline formatting, Text format options, Hyperlinks, Media and iframe support all these makes WYSIWYG a heaven to opt first after installation. No developer would have the heart to say any shortcoming in this feature rich but yet simple module, I am no exception to this too !
Panels provides great salvage to those lost in the sea of page partition and block placement. It might take more than one blog to completely explain all the concepts, merits and advantages of using panels module in our site. But those who use Internationalization might differ a bit with my statement ! Yes, One of the shortcomings that I noticed recently in the panel's module is its ability to deal jointly with the Internationalization.