What rarely used debugging tools you found useful ?
My recent debugging situation on Visual Studio required trapping the breakpoint on fresh built 32-bit DLL, which was loaded by GUI-less executable, which was spawned by COM+ server on remote x64 machine, which was called through RPC from actual GUI. As usual, all worked well on all 32 bit machine, but kept failing on “machine other than development one”. So remote debugging was inevitable.
So after scratching the head beaten against wall for 2 days, I have added 10 sec delay into DLL attach entry point and used Microsoft Remote Debugger wich I never used before. It saved my day.
Another favorite: Java JMX console as a performance “debugging” tool. You can see all threads, memory chart, have a snapshot of any thread stack any time you click. Clicking several times helps to find what exactly is slow in J2EE application.
For Windows/.Net development I am always using Debugview and Ildasm.