@Dennis Dynamic Expresso does not seem to be available for .NET core, which is a shame. I don't use or know how to use mono, so I guess the won't be happening.
Thanks to @AndrewSavinykh, .NET Core and PowerShell have been updated, the .NET Core implementations of F# and Visual Basic were added to TIO, Iron Python has been added, and DynamicExpresso is available for C# (.NET Core).