If the systems are to stay on mainframe/micro land, all IBM, Fujitsu, Unisys platforms support Java. This is one set of ecosystems, where .NET going cross plat

If the systems are to stay on mainframe/micro land, all IBM, Fujitsu, Unisys platforms support Java. This is one set of ecosystems, where .NET going cross platform still misses out to Java, and neither of those companies cares about supporting it on their platforms. There are some half way supported Python, Go and Rust versions as well, although I think they need the "WSL" of the respective mainframe/micro OS, aka UNIX services.