Different makes of the DSO nano?


I’m just curious to know how many different makes of the nano is there and what’s different from the seeedstudio design? Is seeedstudio the original version? Any links to others models? On this forum there are pics of models with mmcx connector and white buttons. Do they have their own firmware with special features? Does the “paul” firmware belong to any of these “custom” models?
Open source hardware is cool but I think cooperation is often better then starting your own branch. There are many examples of this in open source software where new split projects (forks) have been created but later merged back to the original project.