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.
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.
Normally, when a Views field has been assigned both an exposed filter and a contextual filter, then both filters get applied to the View's results set -- always. This is not configurable behaviour. It's hard-coded.
"This module provides an advanced Entity Reference widget that uses a view embedded in a modal dialog for selecting items.
The view can be paginated and have exposed filters."
The Jammer module hides particular elements from edit forms, similar to the Simplify module. This module is mentioned on the revisioning module/s project page on Drupal.org.
Webform Remote Post is a module that works along the Webform module. It eases the integration between Webforms and other web applications (including systems like Salesforce and Eloqua).