TwoDFrame is software for the structural analysis of two-dimensional frames. It is used by hundreds of engineers and thousands of students all over the world. It is completely integrated within Microsoft Windows. It features a powerful graphical user interface unmatched in terms of ease-of-use and productivity. Creation and modification of the structural model, running the analysis, and checking and optimization of the design are all done through the same interface. Graphical displays of the results are at the structural engineer's fingertips. TwoDFrame assists structural engineers with structural timber design (Eurocode 5), structural steel design (Eurocode 3), and reinforced concrete design (Eurocode 2).