There is always a great deal of Joomla! development activity underway and communicating with other developers in the community is essential. This site is a resource for anyone looking to build or maintain software based on the Joomla! platform.
Where to Start
Joomla! 6.0 Alpha2 - Help Shape the Next Generation

The Joomla! Project is pleased to announce the availability of the first Joomla 6.0 Alpha 2 for testing.
Read more: Joomla! 6.0 Alpha2 - Help Shape the Next Generation
Joomla! 5.4.0 Alpha2 - See how it's coming together

The Joomla! Project is pleased to announce the availability of the first Joomla 5.4 Alpha 2 for testing.
Read more: Joomla! 5.4.0 Alpha2 - See how it's coming together
Joomla! 6.0 Alpha1 - Test the Future of Joomla

The Joomla! Project is pleased to announce the availability of the first Joomla 6.0 Alpha for testing.