Collavate widgets can be used as function tools to be embedded onto your website. A function such as Collavate Group Posts can be used as a gadget to place onto a section of your website.
A group post URL widget appears similar to:
Using Collavate's Public Group as an example, the unique URL is https://document.collavate.com/jsp/iframe/group/6560596137082880
The Collavate Public Group URL can be applied into a Google Site iframe gadget as URL and the function will be added to the site.
Or, you can use iframe html code such as below.