I was curious what the IDE story is like for Swift on non-macOS platforms, and while their repo only talks about LSP, turns out that CLion has a Swift plugin: https://plugins.jetbrains.com/plugin/8240-swift

I actually wasn't even aware Swift was cross platform until this thread, so I haven't tried the plugin enough to speak to its strengths or weaknesses, but I for sure trust JetBrains a lot more than any LSP