Gravity Forms is a WordPress plugin used originally for contact forms, but in a more general sense, it allows site owners to create forms to collect information. Gravity Forms can be used for contact forms, WordPress post creation, calculators, employment applications and more.

Ninja Forms is a flexible WordPress Form Builder with an open source code. Due to its intuitive interface and powerful drag-and-drop editor, creating a form takes a few minutes. You can easily create complex forms without coding. There are no limitations regarding the number of forms, submissions, emails, and actions. Use conditional logic to show forms only to specific users, redirect them to a special page after they complete a form.

Wufoo is a web application that helps anybody build amazing online forms. When you design a form with Wufoo, it automatically builds the database, backend and scripts needed to make collecting and understanding your data easy, fast and fun. No coding required!

With Enquiz, you can create different types of quizzes: cost calculation (according to a given formula), selection of a product or service, quiz, and others. The point is that before getting the result, the client must leave contact information that you can use to sell him goods and services.

Formstack is a workplace productivity platform designed to automate processes and streamline workflows so you can focus on what matters most.

Cognito Forms is an online form builder with more free features than any other form builder, allowing you to easily create, publish and manage your forms.

FormDesigner.ru is a multifunctional online designer of web forms, surveys, quizzes and calculators for the site. You don't need to be a programmer to create a form of any complexity.

JotForm is an advanced online form builder that makes it easier than ever to collect the information you need. Build an online form from scratch, or choose from over 10,000 form templates — with hundreds of helpful widgets, 130+ app integrations, and an intuitive drag-and-drop interface, you can quickly create customized forms to power your workflow.

Typeform makes collecting and sharing information comfortable and conversational. It's a web based platform you can use to create anything from surveys to apps, without needing to write a single line of code.

Zoho Forms is a online form maker that lets you create web forms. Create customizable business forms, configure email notifications, and collaborate with your team with this simple drag-and-drop form builder. An efficient data collection tool that helps you gather and manage data from anywhere, even offline.