Fred can handle both incoherent and coherent light using Gaussian beam propagation.
The program offers a high level of visualization using a WYSIWYG (What You See Is What You Get) parametric interface.
The program can import and export IGES, STEP, and OBJ CAD formats.
Fred can also interact with MATLAB and Mathematica using an OLE Automation Client/Server interface.
Fred was used in the design of the NOAO's Large Synoptic Survey Telescope.