Commedia - a component and content plugin that allows you to create a content list containing all of the audios (MP3's, M4a's, WAV's) or videos (MP4's, M4v's, FLV's) that are present in any directory of your site, a FTP-server (folder, single path to ftp-file) or a HTTP(S)-server (folder, single path to http-file or http-radio). It have to play YouTube video also

HelloMaps is a Professional and Innovative Component the only one that allows the integration of Google Maps inside of Joomla! and Third-Party extensions

Joomla forms made easy! Easily create Application forms, Contact forms, Payment forms, Double-Opt-In forms etc.

Set up events on your site in minutes. Group events by category or venue, display as a list or a calendar, collect payments. Smooth setup guaranteed by a dedicated support team. Ohanah gives administrators control over events’ look and feels, so it’s easy to make it fit your site perfectly. Event managers can concentrate on the content with streamlined processes and simple interface for creating events, managing venues, and handling attendees that don’t require them to be Joomla experts.

Fabrik is THE open source Joomla! application builder component.