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.

Geek Goddess

NOTICE: This plugin will no longer be supported nor updated. Infusionsoft has now added Google’s reCaptcha into their forms natively, so this plugin is no longer needed.
Infusionsoft® has a native captcha you can insert into web forms, but it’s not user-friendly, blocks submissions, and is ugly. With the new reCAPTCHA API, Google has released a captcha that the bulk of your users will only have to check a box to pass, optimizing opt-ins while protecting you from inserting spam into your Infusionsoft automation.
As a bonus, activating this plugin in an Infusionsoft web form will also set up basic HTML5 form validation for it.
Requires PHP 5.2+ for json support

GG Infucaptcha reCaptcha for Infusionsoft

Inserts Google’s new reCAPTCHA into Infusionsoft web forms

CTS InfusionSoft Form Shortcode vs GG Infucaptcha reCaptcha for Infusionsoft