The a-hole module is a devious module which breaks JavaScript that doesn't use dependency injection or isolate itself from unexpected elements that could show up through object inheritance. Since there is quite a bit in Drupal that doesn't do this installing this module causes core JavaScript to break and thus break you site.
Context Metatags allows you to set meta tags for each Drupal page.
The module is based on functionality of Context module so it makes Context Metatags as very flexible tool. You can specify meta tags for node page, taxonomy term page or any other path that you can imagine.
gtweetblock fetches Tweets from a Twitter account and store it either in localStorage(Browser) or cache(Drupal cache). It does nothing else than providing a block.