Anton Korotkoff

You may notice there are a lot of plugins that do almost the same things as this one. But there always is a small difference.
In current case plugin allows to add REPEATABLE field sets for any Post Type. Meaning you can add any amount of the same field sets to a post or page while editing it.
Then you can output them in a post loop using built-in API.
Moreover, it is light, simple and useful in the same time.

Complex Meta Fields

Manage complex meta data for any post type.

Richie Arnold

A Contact Form 7 add on that allows you to create repeatable field groups. Tags that are inside the [acrepeater acffr-xxx] tag will a have the ability to be repeated when the user fills out the contact form. Input tags within repeated field tags can be used in the CF7 email template.

AC CF7 Form Field Repeater

Adds repeatable field groups to Contact Form 7.

Complex Meta Fields vs AC CF7 Form Field Repeater