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pdnMesh: A finite element program ================================= Copyright (C) 2001-2005 Sarod Yatawatta pdnMesh is a program that can solve 2D potential problems (Poisson Equation) and eigenvalue problems (Helmholtz Equation) using the Finite Element Method. Common applications occur in electromagnetics, heat flow and fluid dynamics. It can solve problems using both Nodal Based Formulation and Edge Based (Vector) Formulation. The features of the program are as follows. * Automatic mesh generation according to given boundaries. * Adaptive and Interactive mesh refinement. * Problem solution using Cholesky Decomposition or Conjugate Gradient Method with sparse storage. * Eigenvalue solution using LAPACK. * (Optionally) Eigenvalue solution using QR iteration with shifts. * Generating plots of contours, mesh and gradient on screen. * Generating Encapsulated Postscript plots of contours and mesh. * Generating a data file of the mesh to be used by other solvers. * Can import DXF files generated by CAD programs. * GUI is available with glut and GTK/GTKGLExt. Needs OpenGL.

The EAGLE Layout Editor is an easy to use, yet powerful tool for designing printed circuit boards (PCBs). The name EAGLE is an acronym, which stands for Easily Applicable Graphical Layout Editor. The program consists of three main modules: o Layout Editor o Schematic Editor o Autorouter which are embedded in a single user interface. Therefore there is no need for converting netlists between schematics and layouts. This is a Light Freeware Edition. It has the following limitations: o The useable board area is limited to 100 x 80 mm (4 x 3.2 inches). o Only two signal layers can be used (Top and Bottom). o The schematic editor can only create one sheet. o Support is only available via email or through our forum (no fax or phone support). o Use is limited to non-profit applications or evaluation purposes. Apart from these limitations the EAGLE Light Edition can do anything the Professional Edition can do. You can even load, view and print drawings that exceed these limits!

Ngspice is the name of a project and of a program in the project. Spice is the famous circuit simulator developed by the CAD Group of the University of California at Berkeley (UCB). The NG prefix has a lot of meanings: Next Generation, New Good, etc. Choose or invent the one you prefer. The ngspice project aims to improve the capabilities of the Spice3 circuit simulator. The heart of the project is the ngspice program, a circuit simulator derived from spice3f5.

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.

PythonCAD is a CAD package written, surprisingly enough, in Python. The PythonCAD project aims to produce a scriptable, open-source, easy to use CAD package for Linux, the various flavors of BSD Unix, commercial Unix, and other platforms to which someone who is interested ports the program. Work began on PythonCAD in July, 2002, and the first public release was on December 21, 2002.The firs developer team stop to develop PythonCad In the 2007.In May 2009 A new developer team star to develop Pythoncad since now.

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.

TOCHNOG is a free finite element program with many features. TOCHNOG accepts free format input. Boundary conditions can be imposed at geometrical entities, as well as nodes and elements. Among the FE models supported are: differential equations (materials), convection-diffusion equations, Stokes and Navier-Stokes (fluids), elasticity (isotropy and transverse isotropy), plasticity (Von-Mises, Mohr-Coulomb, etc.; plastic surfaces can be arbitrarily combined). Residues in equations and error estimates for all data can be printed or plotted using gnuplot/plotmtv, CalculiX or gmsh. TOCHNOG supports a choice of description frames including Lagrangian, Eulerian and arbitrary Eulerian-Lagrangian (AEL).