@User: As noted in the replies, the best tools for setting up a basic traditional analog design flow are (1) xschem for schematics, (2) ngspice for simulation, (3) magic for layout, DRC, extraction, and GDS generation, and (4) netgen for LVS. Read the #xschem channel discussion for how best to use xschem, integrate it with ngspice, and view waveforms.