What are those things architects use to figure out the porpotionite size of a building they're called blue somethings?
They are called blue prints. Architects use them to plan and size their buildings, and the things within them.
Servius and Celer are the two most famous. They were the men who worked with the emperor Nero to not only design his "Golden House", but to redesign the streets of the city. Most of the other architects seem to be nameless, the temples or buildings that they designed were called by the name of the family or person who was responsible for the building. That is: The Tomb of Augustus, Hadrian's Villa, the Curia…
In general, architects design buildings. Many (if not all) of these architects are actually architechual engineers (they have a degree in AE). Engineer is a more general title than AE. Not all products or services are created by AEs, though. And not all products and services are created by engineers.
Most architects use a CAD program called AutoCAD to produce drawings; there are other alternatives out there (ArchiCAD, Vectorworks, Microstation, Revit) as well but none are so widely used. Most architects use Adobe Photoshop for presentation work, some use Illustrator and InDesign as well. Then there are other specialist programs for writing specifications, producing contract administration paperwork, risk assessments etc. And almost everyone uses Microsoft Office - though few architects can use Excel really well.