freebsd-ports/cad/qrouter/pkg-descr

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Qrouter is a tool to generate metal layers and vias to physically connect
together a netlist in a VLSI fabrication technology. It is a maze router,
otherwise known as an "over-the-cell" router or "sea-of-gates" router. That is,
unlike a channel router, it begins with a description of placed standard cells,
usually packed together at minimum spacing, and places metal routes over the
standard cells.
WWW: http://opencircuitdesign.com/netgen/