123ContactForm

CaptainForm is a WordPress forms plugin that provides top-notch functionality and a beautiful user experience. Launched by 123ContactForm in 2015, the plugin requires no add-ons and enables anyone to create and customize a wide range of forms, surveys, quizzes and polls for all types of businesses and projects.

To help you make the most out of your forms, CaptainForm is integrated with many 3rd party apps and trustworthy payment processors: Google Drive, Dropbox, MailChimp, ActiveCampaign, Smartsheet, SalesForce, Zendesk, PayPal, Stripe, Authorize.net and the list goes on.

Data security and helping customers are their main priorities. Therefore, all their plans (including the free one) include SSL encryption and stellar customer support.
More details can be found at http://www.captainform.com