We are using cubicweb for our project which connects two different apps together in an effective way.
It's really helpful when there is cross domain communication needed between these 2 apps. The support of cubicweb team is also great! I would like to see some more features added so as it can be used across multiple platforms but other than that its good. Using cubicwebs we have managed to integrate both frontend and backend systems into one place with ease where previously everything was seperated and had to be done manually.