This module adds a view mode selector field to any entity

Provides some advanced layout and display options for content. "Display Suite is a module that takes over the rendering of entities."

This is how to create a plugin for CKEditor. I also show how to integrate it with the WYSIWYG module. It was tested on CKEditor 4.3.4 and the WYSIWYG module version 7.x-2.x-dev from 2014-Mar-20.

Here's how to customize CKEditor in Drupal 7. I recommend using the WYSIWYG module instead of the CKEditor module if you plan on having media module integration. I was not able to get media module working with youtube videos and CKEditor 4+ and apparently that's a known issue (Apr 26 2014).

Alternative to the webform module, this module allows using and fields from field API.

Here's how to use the field group module and form API in Drupal 7 to create a form with horizontal tabs.

Uses https://www.projecthoneypot.org/ to prevent spam. I haven't used it, but it comes pretty highly recommended by others. Use http:BL with Honeypot and possibly Mollom for ultimate spam protection.

From the project page, "Implementation of http:BL for Drupal. http:BL can prevent email address harvesters and comment spammers from visiting your site by using a centralized DNS blacklist. It requires a free Project Honey Pot membership. This module provides efficient blacklist lookups and blocks malicious visitors effectively.

This module automatically saves form states using jQuery Sisyphus

With the Field Conditional State module you can change the state of any supported fields form element depending on the content of other fields. This is done by providing an UI for Drupal's States API. All the changes made to a form by FCS (Field Conditional States) utilize only the States API and therefore are clientside only.