Twitter Friends is a nice free social extension for Joomla with which you can display your Twitter Friends and Followers on your Joomla website. Theo van der Sluijs, the author, realized it with a fast loading source code. You can download it via GitHub. It works with Joomla 2.5 and the earlier editions, Joomla 1.6 and 1.7.

Jomres is a great booking component for Joomla 2.5 and Joomla 3.0 by Vince Woll, who provides this long-term realization with ajax driven booking forms and a easy configuration, which allows also to assign certain rights for special user categories. The possibilty to develope slideshows with unlimited images is another fine feature of this extension. Also a rating system is included. Vince Woll provides the Jomres Core with web installer for free. A installation guide is also included. If you want access to the used plugins, try one of the three offered licenses. You can use it also in Joomla 1.5.

Manage and publish your events with redEVENT by redCOMPONENT. This free event managing extension for Joomla gives you the power to create a unlimited amount of events for the presentation on your website. redCOMPONENT equipped it with new features, like a newsletter integration or a dynamical waitinglist, if the demand of an event is to large. Users can register to every event, without Joomla user registration. Also the creation of the registration forms for every event leaves nothing to be desired. You can realize unlimited fields and integrate userfriendly checkboxes or radio buttons. redCOMPONENT provide this great extension on developers website, a registration is the condition. It works fine in Joomla 2.5 and its former version, Joomla 1.5.