- CIL to C++ using CoreRT/AoT compiler [1]
- JVM to CIL using ikvmc [2]
- Quite a few languages to WebAssembly using LLVM [3]
- J# if you are willing to include dead but somewhat significant languages
[1] https://blogs.msdn.microsoft.com/alphageek/2016/10/13/native...
[2] http://www.ikvm.net/userguide/ikvmc.html
[3] https://stackoverflow.com/questions/43540878/what-languages-...