Magic is an open source VLSI layout tool. It is the well thought-out core algorithms which lend to magic the greatest part of its popularity. Magic is among the easiest tool to use for circuit layout.
VLSI engineers will soon have Magic in Fedora Repositories to implement their clever ideas and stay abreast of fabrication technology. It is currently being reviewed.
IRSIM is a “not to miss” tool for simulating digital circuits when using Magic . It is a “switch-level” simulator; that is, it treats transistors as ideal switches. Extracted capacitance and lumped resistance values are used to make the switch a little bit more realistic than the ideal, using the RC time constants to predict the relative timing of events.
Next to come will be the netgen package, which is a LVS netlist comparison tool:)