This module scans the currently installed Drupal, contributed modules and themes, re-downloads them and determines if they have been changed. Changes are marked clearly and if the diff module is installed then Hacked! will allow you to see the exact lines that have changed.
The no_anon module eliminates the need for sessions for anonymous users
Based off of Javascript Aggregator this module will gzip your aggregated css files. For Drupal 6.x
The aim of the JavaScript Aggregator module is to improve performance of your site with less server requests and bandwidth per page.
Extends the administrative interface for Drupal core's "Update status" module
This module implements a views cache plugin that is aware of content and can provide caching for views, until the content in those views changes.
Provides a few advanced options to the core Statistics module.
Spinning up an awesome experience for your site's content editors
This module provide easy Content Delivery Network integration for Drupal sites. It alters file URLs, so that files are downloaded from a CDN instead of your web server.