Extensions

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).
Prompt your users to buy multiple products, at a discounted price, instead of a single one.
With this plugin you will be able to simply add an images to your Joomla articles.
This module can help you to keep a feedback from your customers about which products or service they want.
An AJAX powered LIVE search (Hikashop, SP Page Builder, and K2 Compatible) module that will boost user experience by providing a user-friendly ajax powered search form
The "Cart Module Design" plugin allows you to customize the display of your module cart.
A responsive Joomla! slideshow with multiple image and caption layouts, CSS3 effects, video support, 24 slides per module and optional HikaShop compatiblity.
Create dependent custom fields that load progressively. Or set internal dependencies useful for products filtering.  
My MSG is the component and module that user can send message between each other within the website
Shika is a social Learning Management Extension(LMS) for Joomla and is power packed with awesome features for your dream E-Learning site.