https://www.xsharp.info/

X# is an open source development language for .NET, based on the xBase language. It comes in different flavours, such as Core, Visual Objects, , xBase++, Harbour, Foxpro and more. X# has been built on top of Roslyn, the open source architecture behind the current Microsoft C# and Microsoft Visual Basic compilers

很快就有正式版发布了。