DotNetStackPrinter is an app that prints the stack traces of a target .NET process.

E.g. you run DotNetStackPrinter.exe [pid] and you will get output that looks like:

[18][Internal Frame, 'U-->M']
	[15]System.Threading.ThreadPoolWorkQueue.Dispatch (source line information unavailable)
		System.Threading.ThreadPoolWorkQueue.Dispatch (source line information unavailable)
		...snip...
		System.Linq.Parallel.ForAllOperator`1+ForAllEnumerator`1<System.Int32,System.Int32>.MoveNext (source line information unavailable)
		[8]UserQuery.Foo (C:\Users\rlee\AppData\Local\Temp\LINQPad5\_jwdbjrbm\query_ygxjlx.cs:41)
			UserQuery.Foo (C:\Users\rlee\AppData\Local\Temp\LINQPad5\_jwdbjrbm\query_ygxjlx.cs:41)
			UserQuery.Bar (C:\Users\rlee\AppData\Local\Temp\LINQPad5\_jwdbjrbm\query_ygxjlx.cs:45)
		[7]UserQuery.Foo (C:\Users\rlee\AppData\Local\Temp\LINQPad5\_jwdbjrbm\query_ygxjlx.cs:39)
			UserQuery.Foo (C:\Users\rlee\AppData\Local\Temp\LINQPad5\_jwdbjrbm\query_ygxjlx.cs:39)
		[1]LINQPad.ExecutionModel.Server.StartExecutionTrackingBackstop (source line information unavailable)
			LINQPad.ExecutionModel.Server.StartExecutionTrackingBackstop (source line information unavailable)
			System.Threading.WaitHandle.WaitOne (source line information unavailable)
	...snip...
[1]ProcessServer.Program.Main (source line information unavailable)
	ProcessServer.Program.Main (source line information unavailable)
	...snip..
	LINQPad.ExecutionModel.ProcessServer.Run (source line information unavailable)
	System.Threading.WaitHandle.WaitOne (source line information unavailable)

The numbers indicate how many threads are in each prefix of the stack trace.

The code is basically a thin wrapper around MDbg: documentation and download.