Atlas is a program that computes the resulting moments and reaction forces for a given beam with loads applied to it.
An ordinary application would be to optimize joint positions (i.e. positions with zero moment) in purlins or beams.
The program has a quite simple interface.
It allows the users to enter their data with the mouse, and it displays the resulting moments and shear forces in both a graphical and numerical way.
Maximum bending moments can simply be calculated.