SunThink! is an INRIA Scilab-based program that assists in the good design of solar electricity systems. Its primary purpose is to facilitate the accurate, appropriate sizing of these systems to fit the specific design goals that are held for them.
Free Electricity Network Drawing Interface is a free graphical user interface used
to draw electrical systems. It will be used by a lot of kind of simulations engines
like loadflow or short-circuit calculations, stability and transient simulations.