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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.

Open CASCADE Technology is a software development platform freely available in open source. It includes components for 3D surface and solid modeling, visualization, data exchange and rapid application development. Open CASCADE Technology can be best applied in development of numerical simulation software including CAD/CAM/CAE, AEC and GIS, as well as PDM applications. BUGS: the interesting parts of this port are the libraries, but some components like Wok are not [yet] fully functional.

BRL-CAD is a powerful Combinatorial/Constructive Solid Geometry (CSG) solid modeling system that includes an interactive geometry editor, ray-tracing support for rendering and geometric analysis, network-distributed framebuffer support, image and signal-processing tools, and an embedded scripting language. The package is a collection of over 400 tools and utilities across over 750,000 lines of source code. Included is support for various geometric data format conversions, image and signal processing capabilities, sophisticated ray-tracing based lighting models, network distributed ray-tracing, massively parallel ray-tracing, animation capabilities, data compression, image handling, and interactive 3-D geometric editing. Included is an implementation of Weiler's n-Manifold Geometry (NMG) data structures for surface-based solid models and photon mapping.

This is Gmsh with support of OpenCascade. Gmsh is an automatic 3D finite element mesh generator (primarily Delaunay) with build-in CAD and post-processing facilities. Its primal design goal is to provide a simple meshing tool for academic test cases with parametric input and up to date visualization capabilities. One of its strengths is the ability to respect a characteristic length field for the generation of adapted meshes on lines, surfaces and volumes, and to mix these meshes with simple structured grids. Gmsh is built around four modules: geometry, mesh, solver and post-processing. The specification of any input to these modules is done either interactively using the graphical user interface or in ASCII text files using Gmsh's own scripting language.

Gmsh is an automatic 3D finite element mesh generator (primarily Delaunay) with build-in CAD and post-processing facilities. Its primal design goal is to provide a simple meshing tool for academic test cases with parametric input and up to date visualization capabilities. One of its strengths is the ability to respect a characteristic length field for the generation of adapted meshes on lines, surfaces and volumes, and to mix these meshes with simple structured grids. Gmsh is built around four modules: geometry, mesh, solver and post-processing. The specification of any input to these modules is done either interactively using the graphical user interface or in ASCII text files using Gmsh's own scripting language.

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.

Gerber Viewer (gerbv) is a viewer for Gerber files. Gerber files are generated from PCB CAD system and sent to PCB manufacturers as basis for the manufacturing process. The standard supported by gerbv is RS-274X. The basic difference between RS-274D (the old standard) and RS-274X is basically the addition of apertures in RS-274X. It might be possible to make an RS-274X file out of an RS-274D file and an aperture list. gerbv also supports drill files. The format supported are known under names as NC-drill or Excellon. The format is a bit undefined and different EDA-vendors implement it different. But basically you need to have the tools definition in the file, then the parser is quite tolerant. The different holes are shown as dots in the (scaled) correct size. The different layers of the PCB are separated into different files. gerbv can load all files at the same time and display them "on top of each other". You can independently turn them on and off.

ADMesh is a program for processing triangulated solid meshes. Currently, ADMesh only reads the STL file format that is used for rapid prototyping applications, although it can write STL, VRML, OFF, and DXF files. Features * Read and write binary and ASCII STL files * Check STL files for flaws (i.e. unconnected facets, bad normals) * Repair facets by connecting nearby facets that are within a given tolerance * Fill holes in the mesh by adding facets. * Repair normal directions (i.e. facets should be CCW) * Repair normal values (i.e. should be perpendicular to facet with length=1) * Remove degenerate facets (i.e. facets with 2 or more vertices equal) * Translate in x, y, and z directions * Rotate about the x, y, and z axes * Mirror about the xy, yz, and xz planes * Scale the part by a factor * Merge 2 STL files into one * Write an OFF file * Write a VRML file * Write a DXF file * Calculate the volume of a part

ADMS is a code generator that converts electrical compact device models specified in high-level description language into ready-to-compile C code for the API of spice simulators.