Voltage Drop Calculator for EE, supports multiple segments, 1 and 3 phase.
Bobware tool suite is a set of small EDA tools which are useful in the design of integrated circuits. The suite contains a perl/tk script for region planning large ASICs (application specific integrated circuits.)
Python Champollion Electronic utilities
Verilator converts synthesizable Verilog HDL modules into SystemC modules. This enables users with Verilog code to have a publicly available co-simulation environment. For all information, see http://www.veripool.com/verilator.html.