Quick Links is a very simple plugin that adds a button to WordPress visual editor and helps in creating link to other posts while writing a new one (or editing an old one).
How it works? Simply, you select the text that has to be a link and press the quick links button. Quick Links extract the selected text and search posts relate to that text showing a list of articles.
Quick Links uses Other Posts plugin (if present) to search through the blog archive otherwise do a simple query searching the terms in post titles.
Quick Links can be found on Downloads page.
Here an example video: