Link to the repo:
https://github.com/polymorphicshade/Tubular
It looks like it’s not open source.
You might want to post this in a Linux community then instead of the open source community
Had to look it up too, looks like a way to choose your own push service:
You can do it yourself:
That looks… really inconsistent
It’s this app they’re talking about:
I think it might be this bug
OpenRCT2
An open source re-implementation of RollerCoaster Tycoon 2