We have developed a iNews backend for the client. The backend generate rundowns (or changes) from iNews. It's a very flexible solution based on templates and profiles on the backside. From the client perspective it's just read-only repository.
We can hopefully release it as open source, but we are not there yet.
Former CasparCG Client Lead Developer
Feel free to contact me
if you need any CasparCG related support, development or other consulting.