SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
eXo Platform - Digital workplace solution
JomSocial - Open Source Social Networking Software. Award winning open source community software by JomSocial. This social networking software is widely used by many Joomla users.
Basecamp - A simple and elegant project management system.
EasySocial - Social Network For Joomla to grow your communities with the least time.
Slack - A messaging app for teams who see through the Earth!