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Free and Open Source alternatives for commercial softwares

Commercial Software Similar Opensource Download Link License Used where
MATLAB Scilab http://www.scilab.org/products/scilab/download CeCILL Engineering (Electrical, Mechanical, Civil, Electronics, Embedded systems, Chemical), Science (Physics, Mathematics)
Mathematica Maxima http://maxima.sourceforge.net/download.html GPL Mathematics, Engineering
Cadence pSpice ngspice http://ngspice.sourceforge.net/download.html BSD Engineering (Electrical, Electronics, Embedded systems)
Microsoft Office Open office http://download.openoffice.org/ LGPL All branches
Microsoft Office LaTeX http://www.latex‐project.org/ftp.html LPPL All branches
Mathematica/Maple Sage http://www.sagemath.org/download.html GPL Precise arithmetic, algebra, symbolic computation
Microsoft Windows GNU/Linux http://www.gnu.org/software/software.html GPL All branches
Turbo C GCC http://gcc.gnu.org/releases.html GPL Engineering (Introductory Computing – all branches)
Pro/E BRL-CAD http://brlcad.org/d/download BSD Engineering (CAD)
MASM NASM, FASM http://www.nasm.us/pub/nasm/releasebuilds
http://flatassembler.net/download.php
BSD, BSD Engineering (Electronics, Computer Science)
MS OFFICE Plotting tools Xmgrace, XFIG, GNUPLOT http://sourceforge.net/projects/graceplot/
http://xfig.org/art17.html
http://www.gnuplot.info/download.html
BSD, GPL, Own license (but free) Drawing the figures, plots, flow diagrams
Code composer Studio, IAR Workbench GNU Binutils http://ftp.gnu.org/gnu/binutils/ GPL Assembler, Compilers for micro controllers and DSP Processors (MSP, VC33 etc)
VxWORKS RTLinux, RTAI http://www.faqs.org/docs/Linux‐HOWTO/RTLinux‐HOWTO.html
https://www.rtai.org/
GPL, GPL/LGPL (kernel and user space respectively), Real-time operating System for Desktop and Embedded Systems
KEIL 8051 SDCC http://sdcc.sourceforge.net/index.php#Download GPL GCC SDCC compiler for 8051 controlers
synopsis-CosmosSE, Mentor-Icstudio, Cadence-Virtuoso Xcircuit http://opencircuitdesign.com/xcircuit/download.html GPL schematic design
Mentor-ICstation, Cadence-Virtuoso Magic http://opencircuitdesign.com/magic/download.html BSD Used for chip Layout design
Modelsim ghdl, freehdl http://ghdl.free.fr/download.html
http://freehdl.seul.org/
GPL VHDL compiler
Matlab Octave http://www.gnu.org/software/octave/download.html GPL Numerical Computation
AutoCad KiCad, http://kicad.sourceforge.net/wiki/Downloads GPL CAD system
FreeCad http://sourceforge.net/projects/free‐cad/
S-Plus R http://cran.r‐project.org/bin/ GPL Statistics
Operating System GNU/LINUX http://www.bosslinux.in/ GPL Operating System

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