Contact Form 7 is the platform I use for creating and deploying contact forms across websites I develop. CF7 is the most intuitive solution I have found for non-developers to be able to create their own custom contact forms. Contact forms are one of the most crucial pieces of a successful website. Forms that work well are even more crucial, since a poorly built form will discourage visitors from completing the form and you lose potential leads. CF7 offers powerful building tools, as well as reliable back-end features that increase inbox delivery. Here is the description from WordPress:

Contact Form 7 can manage multiple contact forms, plus you can customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and so on.

Contact Form 7 Tutorial