Tag transform is a unique extension to display your Joomla native tags in a nice way. Since Joomla 3.1, the tagging system enhance the content management in Joomla. All your articles can have tags and then create a semantic link with all tagged content.
Calendar module for Joomla Articles content with ability to filter and search articles based on standard date fields or some custom field (can be selected in the module parameters).
With this extension, your blogs and articles will be displayed nicely in the list and grid layout with beautiful animated filtering and sorting content by tags and categories.
JUX Mashup by JoomlaUX team is a Joomla module that supports retrieving content from Joomla and K2 source
EasyLayouts works with your Joomla content, custom fields, contact forms, menus and modules and allows you to create beautifully formatted content layouts and custom contact forms using a simple drag and drop interface