With this app you can allow your members invite other members.

Create an amazing custom social network
SocialEngine is the best way to create your own social website or online community.
No coding or design skills needed. Launch in minutes.

The current version of LayerSlider (4.6.0) is 100% compatible with WordPress 3.6 and jQuery 1.10.x, but with the earlier versions you may get the "old jQuery issue" error message.
If you got an earlier version with a theme from Themeforest (so you cannot download the latest version from here), you will need to check for an update of that theme. Most of the theme authors are still updated their themes with the latest version of LayerSlider.
If you you are using the latest release of the theme and you still get this error message, you should ask the theme developer about the update.

If you need classified ads extension for your Joomla or Joomla 2.5 version DJ-Classifieds accomplishes the task in most complex and easy way you can imagine. Custom fields, custom locations, paid ads, custom search for each category are just some of features you'll find to built the classifieds section on your website.

Asikart Quickicons is an easy use extension to customize your Joomla! cpanel quickicons.
You just need to upload images and setting icons in Asikart Quickicons component, then add new akquickicons module in admin module manager.

The most comprehensive Invitations system with native api contacts import, automated invitations, intelligent invites, rich invites content, tracking, points integration & much much more

Cross Domain External Embedding & Social media buttons integrated (Facebook LIKE & Google +1).

Project Cost Calculator is a jQuery plugin, using which complex cost calculation forms can be built easily. If you want your customers to have an idea of how much it will cost them for using your services, this is the plugin all you need. Below are the main features of PCC - Project Cost Calculator

A fully customizable ticketed support system offering comprehensive components to manage your website.
From integrated email ticketing and FAQs to testimonials and a custom field system, this product can be adapted easily to fit your website and your business to offer your customers an excellent service.

vBulletin 5 Connect provides unparalleled capabilities for building community websites. The vBulletin software facilitates increased content creation, more engaging content discovery and simplified site management.