brajesh

Embed Iframe is a plugin that will let you embed iframe – an HTML tag that allows a webpage to be displayed inline with the current page, in a WordPress post. Although an iframe can lead to a complicated website, it can be very effective when used appropriately.
<h3>Usage</h3>
Use following tag to insert another page in post using iframe
<pre><code>[iframe url width height]
</code></pre>
e.g.
<pre><code>[iframe http://www.example.com 400 500]
</code></pre>

Embed Iframe

Allows the insertion of code to display an external webpage within an iframe.

Ryan

iframes get a bad wrap, and rightly so in many cases. But when you want to embed 
one website inside of another one in a single step, they’re a really easy way to make it work.
<h4>Usage</h4>
Inside whatever post or page you want to embed another site, use the short code
[iframeWrapper url=http://example.com]
This will put an iframe linking to example.com into your page. The width will 
be 100% of the contain it’s in and the height will automatically adjust to the 
contents of the frame.
This plugin was originally written to embed <a href="http://www.proofbuddy.com" rel="nofollow ugc">ProofBuddy</a> 
sites within a WordPress theme without much fuss. But it should work well to embed 
any site within a WordPress theme.

iframe Wrapper

A small little plugin to embed an auto resizing iframe into a WordPress page or post.

Embed Iframe vs iframe Wrapper