Notifying agents of new or edited articles within the agent workspace

Has anyone found a built-in workflow or 3rd party integration that facilitates knowledge transfers by notifying your support agents of new or modified content within an article, without requiring them to leave the agent workspace? 

I suppose there are two parts to this request:
1. A notification feature within the agent workspace
2. Highlighting the change(s) made within an article, so the agent doesn't have to read the full article and make a guess as to what exactly was updated. 

Any solutions my fellow knowledge managers have found would be awesome.