The new Zorin OS 7 RC is based on Ubuntu 13.04 (Raring Ringtail) and provides a lot of updated software and packages.
Highlights of Zorin OS 7 RC:
• Linux kernel has been updated to version 3.8;
• Pidgin has replaced Empathy;
• Geary Mail has replaced Thunderbird;
• A brand new desktop theme has been included;
• The Zorin Web Browser Manager has been added.
Find out more here: zoringroup.com