What's a good open-source debugger & memory analyzer for Windows?

Question

In a Unix world I've been happily using gdb for debugging and valgrind for memory analyzation.

Are there open-source quality alternatives for Windows?

I'm looking for lightweight pieces of software that do what you need, and never get in your way (just like gdb and valgrind).

Answer 1

Microsoft Visual Studio Express edition is free (but not open source).

In the Microsoft Debugging Tools there's also the WINDBG debugger. Also free, not open source.