Nice!
At ScRiBLink you’ll find a free, powerful whiteboard where you and your colleagues can work on your ideas together.
No registration is required : )
 
Additional features like
- picture upload
- chat
- math functions
- multiple users
- ….
give you a good base to start sharing concepts online, etc..
 
Note: Maybe it’s not working behind corporate firewalls because it uses additional tcp ports.
 
 
Online Whiteboard
 
If you know about alternatives, please comment.