Are there any stand-alone C#/.NET Debuggers?

Question

I'm wondering if there are any Visual Studio quality debuggers that can run outside of Visual Studio, instead of inside of the IDE? It would be great if it were Open Source so I could check out how it was done, but that's not a requirement, neither is that be product free.

Answer 1

WinDBG with SOS extension

Following has series of 6 videos, to get started on WinDBG http://channel9.msdn.com/Series/-NET-Debugging-Stater-Kit-for-the-Production-Environment

WinDBG is also useful for following scenarios, where VS debugger is not effective/available

1. Hangs
2. Crashes
3. Deadlocks
4. Production environment