Randell Miller

One of the issues with stock WordPress is that it tends to not like having Javascript in general and linking to an external Javascript file in specific inside of posts or pages. This is problematic for people who are integrating InfusionSoft and WordPress. We tried to find a good solution for this, but failed to find any good plugins which would be suited for the task.
So, we wrote our own.
It is a standard WordPress Plugin. All you need to do is unzip the file to your plugins directory, or use the zip file upload feature. Once you’ve installed it, simply activate. There are no special settings or anything else you need to do.
To embed an InfusionSoft web form into a post or page, use the following short code:
<pre><code>[infusionsoft_form src="<Your form's url>"]
</code></pre>

CTS InfusionSoft Form Shortcode

This plugin adds a shortcode to easily insert into posts and pages the javascript code required to embed an InfusionSoft web form.

Ryan Nevius

An add-on for Contact Form 7 (CF7) that provides a straightforward method to capture leads, tag customers, and send contact form data to InfusionSoft. Supports HTML5 input types.
NOTE: This plugin requires Contact Form 7 version 3.9 or later.
This plugin is not offered, sponsored, associated with or endorsed by Infusion Software, Inc.

Contact Form 7 – InfusionSoft Add-on

thank you

Plugin has really clean and easy to follow code, with helpful comments. It doesn't have certain referral tracking fields we needed to send to InfusionSoft, but adding them was incredibly easy because of how well written this plugin is.

Very Clean Code

An add-on for Contact Form 7 that provides a way to capture leads, tag customers, and send contact form data to InfusionSoft.

CTS InfusionSoft Form Shortcode vs Contact Form 7 – InfusionSoft Add-on