I am talking about MAGIC for layout, but there is a whole suite of tools from the same lab. IRSIM is a switch-level simulator that's also very useful, and there are a number of other tools for schematic capture, analog stuff, and a whole digital synthesis flow.
It's all open-source, and if you're building a chip with an SCMOS process or another process with lambda-based design rules, it's still a pretty nice set of tools to use.
Incidentally, if you're building open-source silicon, MAGIC is somewhere in that process, and I assume the Berkeley logic placer is still there even though the front-end is usually something else.
