Jeffrey

Contact Form 7 is an awesome WordPress plugin that provides all sorts of great features for creating Contact Forms. 
I’ve used it on a lot of sites with great succes.
One thing it doesn’t handle though, are customfields. 
With this plug in you can now use customfields in the mail section of Contact Form 7!
I created this plug-in because I had the need to use the same contact form on numerous places but the email adresses needed to be diffrent for all of them. 
(I was using it to create a showcase website in wich visitors are able to contact the creator of the work/art, without showing the full email adress)
What you could do with this might include:
<ul>
<li>Use the same contact form in different posts/pages</li>
<li>Send custom field values in the email </li>
</ul>
There are many more case-specific examples. I searched for a solution, but there was none to be found. 
This plugin provides an elegant solution that leaves the Contact Form 7 Plugin intact.
<h4>WHAT DOES IT DO?</h4>
This plugin provides a new special mail tag for the mail section of the Contact Form 7 Plugin. It allows you to get custom field values in the mail section of Contact Form 7
<h4>HOW TO USE IT</h4>
After installing and activating the plugin, you should use it like the following:
Double underscores are key!
The plug in recognizes a new special mail tag: 
[_customfield]
The tag alone doesn’t work though! 
You need to add two underscores after the tag: 
[_customfield__]
After this you can enter your custom field key i.e.: 
[_customfield__fieldName]
<h4>NOTE</h4>
Multiple values per key (an array) are converted to a comma separated string.

Contact Form 7 Customfield in mail

This plugin provides a new tag type for the Contact Form 7 Plugin. It allows the use of customfields from a post to be used in the mail section

Anthony Montalbano

AMBR Detroit

This plugin makes it easy to create a drop down list of years. This plugin is compatible with Advanced Custom Fields 4 and 5.
A few example use cases:
<ul>
<li>Selecting credit card expiry</li>
<li>Setting a minimum age (18, 21)</li>
<li>Choose year graduated (option for user to choose Current)</li>
<li>Selecting a decade </li>
<li>And many more!</li>
</ul>
This plugin has a wide range of options to give you a range of possibilities of creating a year dropdown.
Plugin’s features:
<ul>
<li>Set the date range relative to number of years before (or after) the current year (i.e. – from current year to 5 years in the future).</li>
<li>Set the date range between exactly 2 years (i.e. – from 1900 – 2016)</li>
<li>Set the incremental step between the range (5 years, 10 years)</li>
<li>Order dates in chronological or reverse chronological order</li>
<li>Allow the user to set the year as “Current” (or any variation of the term)</li>
</ul>

ACF: Dynamic Year Select Field

Great ACF plugin. Couple of little bugs, e.g. in the Edit Field Group page this field trys to stop the Update button action by saying that the page has changed when it shouldn't. Also this field isn't compatible by the ACF Add-on for Admin Columns Pro which means that this field can't be edited using Admin Columns Pro Inline Edit function.

Good little plugn

Adds a dynamic year select option for Advanced Custom Fields.

Contact Form 7 Customfield in mail vs ACF: Dynamic Year Select Field