What is the difference of SailfishOS and Mer Project?
The Mer Project is the base respectively core system of SailfishOS. But what are the components of SailfishOS, that are going beyond the Mer Project.
After I have studied the Mer Project Wiki, I learned, that this project was initially to keep MeeGo alive after Nokia dropped the further development and support for their devices. It seems, that the Mer Project is split up into SailfoshOS and Tizen. Tizen is very interesting, because it is clearly open source. Unfortunately Wikipedia references a report about significant security issues. Wikipedia reports, that also Plasma Mobile is based in the Mer Project, but this OS seems to be in a very early alpha stage. Let's see , what Purism will do.
So, again: What is the difference to SailfishOS, because the developer documentation is referencing of the Git repository of the Mer Project. It seems to me, that the pure Mer Project died and is only alive under the contribution of Jolla. This is an interesting fact, because the Mer Project claims, that the operation system is open source. What are close source components of SailfishOS?