ProxyDesigner 

ProxyDesigner is a free PC-based UML software design tool that allows software developers to graphically create complex software designs, patterns, and architectures that can be shared with other developers on-line.
uml free design tool case diagram model flow modelling ood oo programming coding diagramming

libpropc++ (for C++) 

Template library for properties in C++ (used like 'widget.color = "red";). In class Widget use: prop::PropertyWidget, Color, &Widget::set_color, &Widget::get_color color; Binding properties to auto-synchronize their values.
c++ properties c++ template library c++ library foundational library libsigc++ signal programming object oriented programming object orientated programming signals gui programming object oriented methodology oo method oo methodology