I'm not affiliated. From what I understand, they provide an open-source implementation of the relay server: https://github.com/n0-computer/iroh/tree/main/iroh-relay (which may or may not be what they actually run as part of their hosted offering).
If you use their offering, you probably get some kind of web interface for metrics that isn't open-source.
You don't really need the different IDEs. For example, you can install the Rust plugin and the TypeScript plugin in IntelliJ Ultimate, without needing RustRover and WebStorm.