Free extensions Joomla
Tabs custom HTML-code module

With this module, you can easily create a tab on your website that will display custom HTML-code. Powered by jQuery.
Tabs modules positions module

With this module, you can easily create a tab on your website, which is essentially a different module positions. Powered by jQuery.
Quick Contact Form module

The module displays a contact form with data validation on the fly. Powered by jQuery.
Yandex share module

The module allows your visitors to post a link to the page of your site in social networks or blogs.