With Mootools Enabler/Disabler, you decide, if Mootools will be loaded on your website, and that saves up to 600 kb bandwidth. Although it is included in the Joomla package, you don't needed in most cases. The installation and handling is very easy. You can add all components, which use Mootools, directly in the plugin manager and disable it for all other. The download is free. Mootools Enabler/Disabler is native to Joomla 2.5 and Joomla 3.0.

FLEXIcontent is a free alternative to Joomla's article manager with more features. It allows you to manage your whole content, like articles, image galleries or video galleries, with one interface. That makes the handling more flexible. You can also create content types and multi-categories or configure up to 10 components at the same time. The download is free. FLEXIcontent is native to Joomla 2.5. It works also in the earlier version, Joomla 1.5.

CodeSlider based on jQuery library and works with MooTools. Its a simple free image slideshow module for Joomla 2.5, which display your favorite images in a slideshow. The download is free. You can use CodeSlider by your agreement to GNU/GPL V2 or later.