gEDA - Freeware, full GPL'd suite of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production. Currently, the gEDA project offers a mature suite of free software applications for electronics design, including schematic capture, attribute management, bill of materials (BOM) generation, netlisting into over 20 netlist formats, analog and digital simulation, and printed circuit board (PCB) layout.
Eagle CAD - Freeware, the most popular PCB editing software, although definitely has a sharp learning curve.
Eagle3D - Freeware, an extension to Eagle CAD to view your circuits in 3D.
KiCAD - Freeware, for the creation of electronic schematic diagrams and printed circuit board artwork. Has 3D circuit viewing capabilities.
Altium - Used to be called Protel.
PADS - PCB design software.
NI Ultiboard - National Instruments PCB design software.
PCB Trace Width Calculator - Freeware Javascript useful to determine if your circuit traces are thick enough to not fry.
Proteus - PCB design and simulation software, can also simulation MCU's.
OrCad - PCB design and it's simulation software, PSPICE.
Falstad - Freeware Java applet circuit simulator (no software to install).
VMLAB - Freeware tool for AVR develoment. VMlab can be integrated with WinAVR, also it supports digital and analog simulation and debugging. Really, it is the "lightweight Proteus".
NI Multisim - National Instruments electronics simulation software.
TI SPICE - Freeware Texas Instruments SPICE-based analog circuit simulation.
TINA - TI's electronics simulation software, with MCU capabilities.
AUV Workbench - Freeware, simulation software designed for expensive AUV platforms, but easy to use with nice graphics. Developed by NPS Center for AUV Research, Naval Postgraduate School.
Player Stage - Freeware, robot simulation software, but not user friendly.
Microsoft Robotics Studio Visual Simulation Environment - Less than user friendly robot simulation software bought from AEGIS.
RoboRealm - Freeware, its simple GUI interface allows you to do histograms, edge detection, filtering, blob detection, matching, feature tracking, thresholding, transforms and morphs, coloring, and a few others.
Computer Vision Source Code - a collection of computer vision software links
Google Sketchup - Freeware (with limitations) CAD software. For more info, see Google Sketchup Info. Also check out Airman00's robot CAD parts collection.
Autodesk Inventor - 3D CAD software, this is what I use to design my robots.
Solidworks - 3D CAD software.
Rhino 3D - 3D CAD software.
To learn more about FEA and CFD, please read my FEA and CFD tutorial.
ANSYS - All ANSYS FEA products.
Solidworks Simulation Professional - Both thermal and stress analsys tools.
COMSOL - Multiphysics software, with neat capabilities.
Open Source FEA Software List - a bunch of free FEA software, but with little to no documentation.
FEMAP - Industry software with thermal and flow solvers.
Fluent - Flow solver now owned by ANSYS.
ANSYS CFX - The ANSYS flow solver.
Solidworks Flow - Solidworks fluids solver.
OpenCFD - Freeware fluids solver.
CFdesign - Thermal fluids solver for use with AutoDesk.
There are a few CFD software suggestions on the forum: 188 and 2284.

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