Excel Structural Analysis Package
This is a mostly complete, i.e. sans real testing, 2D frame analysis written in Excel with a VBA backend.
There may be some problems with the error checking that was implmented, user input type checking mostly. It was one of the last things I was working on and can't remember if I completed the testing.
It has a robust solution routine with an LU decomposition with partial pivoting written natively in VBA. It allows for rapid solution of multiple load cases. The code is written in an OOP style, or as close as you can get in VBA.
There were plans to include many additional features but I really don't like writing VBA or using Excel. There are places in the code to include shear deflection of the beam elements for 2D frames, truss elements, and 3D beam elements.
I seriously doubt that I will be working on this in the future. If someone paid me a respectable amount and it would remain open source I would consider finishing it because it is kinda cool I in a "You made Excel do what?!" kind of way.