Embedding in mediawiki and finding a collaborative tool

I need to embed a voki ([login to view URL]) video and a crocodoc ([login to view URL]) document to pages on a mediawiki site. I know there is an extension for voki ([login to view URL]), and crocodoc has api ([login to view URL]), so this should be very very simple. Also, I need a free tool that people can write associations of a concept, and that is open for editing without requiring registration (something like this: [login to view URL]). I want to embed that tool in a mediawiki page, to be able to write a concept in the middle, and people will be able to add words or drawings from the mediawiki page in the embedded tool, that will remain saved on that wiki page, so that next time it is opened, everything is saved there.