We at Academic Excellence use a custom developed Online Collobarative suite with Moodle @aspiringkidz.com providing etutoring services for students in the USA.
We have been able to use Single Sign On (SSO) method to seamlessly integrate Moodle with our Online Collaborative Suite Application (which provides Whiteboard, Chat, Audio, Video and use of Pen Tablet). The application works with Windows and MAC OS Platforms. We currently have two versions of the Online Collaborative Suite:
(a) for the etutoring services we use one-on-one Online Conferencing.
(b) the second one has one to many user Online Conferencing.
fyi: Only the presenter/teacher WebCam is enabled for video. The student/participants will not be able to display their Video.
The Online Collaborative suite's database can be used with MySQL or MS SQL.
If you need to schedule a demo to see the features, please feel free to contact me at firstname.lastname@example.org