A small little plugin to embed an auto resizing iframe into a WordPress page or post.
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.
Inside whatever post or page you want to embed another site, use the short code
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 ProofBuddy sites within a WordPress theme without much fuss. But it should work well to embed any site within a WordPress theme.