Softwares Energy Certification
It is actually an energy simulation software. Much more precise than explained above. Uses DOE-2 calculation engine.
This is the official software for energy certification of buildings. It takes advantage of the calculations made in the Lider (HE-1). It is more precise than the simplified methods (CE3 and CE3x).
CE-3 and CE3x
Both CE3 and CE3x are the official software for energy certification of existing buildings. These are simplified software programs that use the Calener calculation engine.