Yes, now we have a plugin called "multi-user" that allows real-time collaboration on Blender projects over the network. You can think of it as Google Docs for Blender where multiple people connected to the same network either through LAN or the internet can work on a common scene in real-time, with changes visible to each other.
It already has good documentation that should cover most of your questions on using it.
It's being maintained by a guy named Swann Martinez as his research project as far as I know. Since it's in the development phase, it might not be stable over all the aspects.
You can check out this video for a better understanding of the concept of the plugin.
Hope this helps :)