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PyCAM is a toolpath generator for 3-axis CNC machining. It loads 3D models in STL format or 2D contour models from DXF or SVG files. The resulting GCode can be used with EMC2 or any other machine controller. PyCAM supports a wide range of toolpath strategies for 3D models and 2D contour models.

NASA Open Source Parametric Geometry OpenVSP allows the user to create a 3D model of an aircraft defined by common engineering parameters. This model can be processed into formats suitable for engineering analysis.

QElectroTech is a Qt4 application to design electric diagrams. It uses XML files for elements and diagrams, and includes both a diagram editor and an element editor.

Qfsm is a graphical editor for finite state machines written in C++ using Qt. Finite state machines are a model to describe complex objects or systems in terms of the states they may be in. In practice they can used to create regular expressions, scanners or other program code. Current features of Qfsm are: - Creation, editing, loading and saving of binary and ASCII machines - Drawing of states and transitions - Binary and ASCII condition codes - Setting of a start state and end states - Zooming - Cut, copy & paste inside Qfsm - Printing of diagrams - Multiple windows - Integrity check - Interactive simulation - AHDL/VHDL export - State table export (Latex, HTML)

Qucs is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit. After that simulation has finished you can view the simulation results on a presentation page or window.

RepSnapper is a host software for controlling a RepRap 3D printer. It has a 3D OpenGL interface, slices objects and calculates the extrusion toolpath. It can manipulate 3D objects and save constellations in STL and AMF format.

The GDSII Ruby Library provides an easy-to-use interface using Ruby to reading and writing GDSII files.

SCEPTRE (System for Circuit Evaluation and Prediction of Transient Radiation Effects) is a general purpose circuit analysis program which provides all three major analyses, AC, DC, and transient analysis, on either linear or nonlinear networks. It employs a free-form input language and state variable methods to simulate problems of interest to electrical engineers.

SCOTCH is a software package and libraries for graph, mesh and hypergraph partitioning, static mapping, and sparse matrix block ordering. Its purpose of Scotch is to apply graph theory, with a divide and conquer approach, to scientific computing problems such as graph and mesh partitioning, static mapping, and sparse matrix ordering, in application domains ranging from structural mechanics to operating systems or bio-chemistry. The SCOTCH distribution is a set of programs and libraries which implement the static mapping and sparse matrix reordering algorithms developed within the SCOTCH project.

SPICE is a general-purpose circuit simulation program for nonlinear DC, nonlinear transient, and linear AC analyses. Circuits may contain resistors, capacitors, inductors, mutual inductors, independent voltage and current sources, four types of dependent sources, lossless and lossy transmission lines (two separate implementations), switches, uniform distributed RC lines, and the five most common semiconductor devices: diodes, BJTs, JFETs, MESFETs, and MOSFETs. Patch Levels I and II (including a new spec command for spectral analysis) and the level 2 JFET model are courtesy from the Macquarie University. Online documentation at: