Can you simulate a schematic?
We usually call that simulation, not emulation. If we were to emulate the board, that means having another device perform similarly. There are plenty of circuit simulators, most famous of which is Spice (LTspice is one popular version). Qucs, ktechlab, klogic (limited to digital), and gnucap are a few others; for those without a graphical interface, there typically is one separately, such as oregano or gspiceui.