We just released X2CRM 2.2 built on the Yiiframework. BSD Licensed.
Live demo and download - http://www.x2crm.com
New features in this release include:
Unique Case # and fields for nature of request and service status
Generate a custom Web Form to let contacts request a new service case
Automatic response email with case # when a contact makes a service request
Improved import tools
More robust global import
Customizable import for contacts (you can now import data in almost any format, and can manually map the columns to X2CRM fields.
CKEditor has replaced TinyEditor as the docs and email editor.
Images can now be dragged directly into the editor from the Media widget
You can upload images from within the editor
Numerous bug fixes
You can now upgrade to the Professional Edition (on the admin page)
Emails sent using the inline email form now detects when the user opens it (like campaigns do)