Here are some cool sites that I found that list Twitter Bootstrap resources:
The title says it all with: The Big Badass List of Twitter Bootstrap Resources
W3Resource explains how to use Twitter Bootstrap to make it responsive. What that means is that you can use Twitter Bootstrap and have it look good regardless of the platform it is being viewed from – monitor, tablet, phone.
Onextrapixel lists Bootstrap extensions in this article, including extensions for making jQuery adopt the Bootstrap look.