Beherit

Lightweight and simple contact form with no additional user-unfriendly options. You can add the contact form to any page with a shortcode <code>[contact_form]</code>. Plugin is integrated with plugin <a href="https://wordpress.org/plugins/akismet/" rel="ugc">Akismet</a> and <a href="https://wordpress.org/plugins/grecaptcha/" rel="ugc">GreCAPTCHA</a> which protect against spam.

Lite Contact Form

Lightweight and simple contact form with no additional user-unfriendly options. Can be additionally protected against spam by using Akismet and Google …

susheelhbti

Have you seen the lead generation form on the company like zerodha, Kotek Mahidra bank, JIO fibre. I setup this plugin in tradition contact form.
They focus on verify the data using email and sms so that they avoid garabase data. And also make simple form .
Checkout these links
https://zerodha.com/open-account 
https://www.kotak.com/811-savingsaccount-ZeroBalanceAccount/811/ahome2.action
They first ask mobile number, email id and then send OTP on these and verify and then only they ask other details if user failed to verify then they ignore.
Using wordpress ajax in whole process the page don’t get reload.

Saksh Callback Request Form

Inspired by zerodha, Kotek Mahidra bank, JIO fibre lead generation form I setup this form it first ask users email ID and mobile number and then send  …

Lite Contact Form vs Saksh Callback Request Form