Which tools do you miss in D?

[Kapps]

A debugger integrated into an IDE is the most important feature
I'm missing. Debugging code in C# where I can step into easily,
see all the code I'm in, see all the variables, all graphically,
is extremely useful. In D I have to resort to printf except for
using gdb/lldb to look at the stack-trace in a segfault.

Mono-D works nicely for coding, but I have not had any luck
getting debugging working in it in OSX (but I use OSX Mavericks
which replaces things like gcc with aliases to clang and includes
only lldb by default).