Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!
Jackmail - A newsletter plugin for Wordpress.
Jotform - Free Online Form Builder & Form Creator
Wordfence - Comprehensive security plugin for WordPress.
FORM.com - FORM.com is an enterprise mobile forms software and solutions perfect for optimizing online and offline inspection, audit, compliance operations and more.