Managed.Reflection based ildasm clone
.NET DllExport with .NET Core support (aka 3F/DllExport aka DllExport.bat)
Online C# assemly decomposition tool like IlDasm.
VS Code extension to monitor .NET Processes for GC information in real time, or drill into .NET DLLs by viewing the IL and compiled code. Relies on ildasm and a public .NET JIT tool PMI.
ildasm for vim