Websorcery

This plugin automatically hides the “Add to Cart” button for WooCommerce products that have no price set (or empty price). Instead, it displays a customizable “Request Price” button that opens a lead capture modal.
Features: 
* Automatic detection of checking empty prices. 
* Lead capture form (Name, Phone). 
* Email notifications. 
* Customizable design via settings. 
* GDPR compliant checkbox. 
* Localization support (i18n).

Websorcery Request Price

Replaces "Add to Cart" with "Request Price" button for lead generation.

muehlwitz

This Plugin adds a Form to an existing Page. All you have to do is to add the Shortcode [wpideaforge] to that Page. After that your Visitors can suggest Ideas for Articles you could write in the near Future. Other Visitors can vote for Ideas so you can see what is popular, and what is not.

wpIdeaForge

Let's user suggest Ideas for upcoming Articles.

Websorcery Request Price vs wpIdeaForge