CSharp https://github.com/dotnet/roslyn

Clojure https://github.com/clojure/clojure-clr
Clojure https://github.com/dmiller/clojure-clr-next

Eiffel https://www.eiffel.org/doc/solutions/The_Eiffel_for_.NET_language

Forth https://github.com/lucabol/Forth.Net (Old, but looks complete)

FSharp https://github.com/fsharp/fsharp
FSharp https://github.com/fable-compiler/Fable (F# to JavaScript, TypeScript, JSX, Python, Dart, and Rust transpiler)

Javascript and Typescript https://github.com/sebastienros/jint

JVM languages https://github.com/ikvmnet/ikvm

Mond https://github.com/Rohansi/Mond

MRuby https://github.com/hadashiA/MRubyCS (Just a VM, and no CIL compilation)

Nemerle https://github.com/rsdn/nemerle

Lua https://github.com/nuskey8/Lua-CSharp (Just a VM, and no CIL compilation)

P https://github.com/p-org/P

Pascal https://github.com/pascalabcnet/pascalabcnet

PHP https://github.com/peachpiecompiler/peachpie

Python https://github.com/IronLanguages/ironpython3

Rust https://github.com/FractalFir/rustc_codegen_clr
Rust https://github.com/FractalFir/wrapped_mono (Mono embedded in Rust)

Scheme https://github.com/IronScheme/IronScheme

Spiral https://github.com/mrakgr/The-Spiral-Language (compiles to F#)

VisualBasic.NET https://github.com/dotnet/roslyn

WebAssembly https://github.com/RyanLamansky/dotnet-webassembly

Free for personal use, and not open source:

Dyalog APL https://docs.dyalog.com/19.0/dotNET%20Interface%20Guide.pdf
(Not running on dotnet, but providing deep interop)

Paid and closed source:

APL 2000 http://apl2000.com/

Cobol: https://www.microfocus.com/documentation/visual-cobol/vc80/VS2022/GUID-426E2D70-3FC9-478C-9828-9959078091DC.html

C#: Hydrogene
Go: Gold
Java: Iodine
Object Pascal: Oxygene
Swift: Silver
Visual Basic: Mercury

All available here: https://www.remobjects.com/elements/