phpSugar team released PHP Melody 1.6. We're pleased to introduce our latest release. We consider PHP Melody 1.6 to be a great release and a big leap forward. This new release comes with a complete article manager which makes it a true CMS. Among the most important features, we're proud to mention PHP Melody's ability to embed any sort of video or audio and the 38 new video sources from where you can import videos directly.
Existing valid customers can log into the customer area and download the full package or just upgrade to 1.6.
In case you haven't decided to use PHP Melody, we encourage you to learn more about PHP Melody 1.6 and what It can do for you.
The previous release was 1.5.3 however since this is an upgrade and not an update PHP Melody changed digits from 1.5.x to 1.6.
The upgrade to 1.6 has brought many needed changes and the developers extended its functionality making it once again a great video CMS.

phpFox is a Social Networking PHP script that is easy to install and packed with features and modules such as profile, blogs, forums, groups etc. The community portal allows you to easily manage your site directly from the admin panel and the product is non-encrypted - giving you the option to customize your site's design and all the features to the fullest. Start your own social network today!

Mint is an extensible, self-hosted web site analytics program. Its interface is an exercise in simplicity.
Visits, referrers, popular pages and searches can all be taken in at a glance on Mint's flexible dashboard.

I found this on another forum and know some people are looking for it so thought it would be wise to post it.

vBulletin is a powerful, scalable and fully customizable forums package for your web site. It has been written using the Web's quickest-growing scripting language; PHP, and is complemented with a highly efficient and ultra fast back-end database engine built using MySQL.

vBulletin is the ideal community solution for all medium-to-large sites.

Live Demo: http://la2blood.ru/

Arthemia Premium is a magazine style theme that unleashes the power of Wordpress, transforming it into a simple-yet-powerful CMS with the automatic thumbnail generation feature. A nice and elegant blend of a blog and a magazine.

With numerous built-in features, Arthemia Premium will convert your old-fashioned Wordpress blog into an amazing and powerful front-end. If you are running an online magazine or a corporate website, Arthemia Premium is the one-stop solution for you.

This gallery is really powerful. You can add as many galleries as you like and as many pictures inside each galley. You don’t need to edit the flash FLA file. Everything is inside XML and all pictures are external files in a folder. The only thing you need to do is to choose your pictures and edit XML files that will automatically update your flash gallery.

Demo: http://www.flashden.net/files/24046/index.html