Tools to profile memory usage

Also looking for a memory profile tool for Unity applications

I'm not sure what you actually want the profiler to display. Every object has some kind of memory usage and that is its member variables. Referenced objects can't be count for a certain class instance since multiple instances can hold the same reference. So every object is on its own.

Most objects are placed on the heap and don't belong to the creator object. They just eats up memory but you can't refer to a specific Unity script which might have created the instance.

So what kind of view / display do you want / expect?

It would be nice to get a fragmented overview of the Unity application's memory usage. My company is having problems figuring out what the application's memory is used on. Our application uses 1.6GB and there is about 1GB we can't account for. Is it used on Unity assets, Mono objects or something totally different? It is hard for us find out easily.

Yeah it's always useful to be able to track each individual allocation and the call-stack when it was allocated. Currently seeing a 700 kB allocation every few seconds in my game but I have no way of profiling for it.

Mono supports at least parts of the System.GC (garbage collector) interface, which might be helpful, though it won't tell you about unmanaged allocations inside the Unity engine. More details here -- http://msdn.microsoft.com/en-us/library/system.gc_members(v=vs.90).aspx