I'm developing a CZML library in scala at: (https://github.com/workingDog/scalaczml)
I've also written a basic websocket server sending a CZML document to
a Cesium client that then displays it on the globe at: (https://github.com/workingDog/czmlServer)
It would be good if some scala/cesium enthusiast could take ScalaCZML for a spin and report back any issues.