I discovered Poco entirely by accident, and I am really impressed to what I have seen so far. I am a user of Qt both as a hobbyist and as a professional, but I would really love a quality alternative to it, and Poco seems just the right tool for the job (minus the gui, that is).
Anyway, here is is one item from my wishlist: a library of reactive variables and containers, i.e. a set of classes that fire events when something important happens to them.
For example, a reactive integer:
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ReactiveInt i = 0;
i.onChange += delegate(myClass, &MyClass::myFunction);
i = 5; //invokes MyClass::MyFunction.
A reactive linked list:
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ReactiveList<int> data;
data.onInsert += delegate(myClass, &MyClass::myFunction1);
data.onRemove += delegate(myClass, &MyClass::myFunction2);
data.onClear += delegate(myClass, &MyClass::myFunction3);
data.push_back(1); //invokes MyClass::myFunction1.
data.erase(data.begin()); //invokes MyClass::myFunction2.
data.clear(); //invokes MyClass::myFunction3.
Such a module will allow to easily separate data from other functionality in an application, allow easy use of the Model-View pattern, and also help debugging (catching those erroneous values when the corresponding variables are assigned).
The module should ideally have reactive primitives and reactive containers.