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Free and Open Source alternatives for commercial softwares

Commercial SoftwareSimilar OpensourceDownload LinkLicenseUsed where
MATLABScilabhttp://www.scilab.org/products/scilab/downloadCeCILLEngineering (Electrical, Mechanical, Civil, Electronics, Embedded systems, Chemical), Science (Physics, Mathematics)
MathematicaMaximahttp://maxima.sourceforge.net/download.htmlGPLMathematics, Engineering
Cadence pSpicengspicehttp://ngspice.sourceforge.net/download.htmlBSDEngineering (Electrical, Electronics, Embedded systems)
Microsoft OfficeOpen officehttp://download.openoffice.org/LGPLAll branches
Microsoft OfficeLaTeXhttp://www.latex‐project.org/ftp.htmlLPPLAll branches
Mathematica/MapleSagehttp://www.sagemath.org/download.htmlGPLPrecise arithmetic, algebra, symbolic computation
Microsoft WindowsGNU/Linuxhttp://www.gnu.org/software/software.htmlGPLAll branches
Turbo CGCChttp://gcc.gnu.org/releases.htmlGPLEngineering (Introductory Computing – all branches)
Pro/EBRL-CADhttp://brlcad.org/d/downloadBSDEngineering (CAD)
MASMNASM, FASMhttp://www.nasm.us/pub/nasm/releasebuilds
http://flatassembler.net/download.php
BSD, BSDEngineering (Electronics, Computer Science)
MS OFFICE Plotting toolsXmgrace, XFIG, GNUPLOThttp://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 WorkbenchGNU Binutilshttp://ftp.gnu.org/gnu/binutils/GPLAssembler, Compilers for micro controllers and DSP Processors (MSP, VC33 etc)
VxWORKSRTLinux, RTAIhttp://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 8051SDCChttp://sdcc.sourceforge.net/index.php#DownloadGPLGCC SDCC compiler for 8051 controlers
synopsis-CosmosSE, Mentor-Icstudio, Cadence-VirtuosoXcircuithttp://opencircuitdesign.com/xcircuit/download.htmlGPLschematic design
Mentor-ICstation, Cadence-VirtuosoMagichttp://opencircuitdesign.com/magic/download.htmlBSDUsed for chip Layout design
Modelsimghdl, freehdlhttp://ghdl.free.fr/download.html
http://freehdl.seul.org/
GPLVHDL compiler
MatlabOctavehttp://www.gnu.org/software/octave/download.htmlGPLNumerical Computation
AutoCadKiCad,http://kicad.sourceforge.net/wiki/DownloadsGPLCAD system
FreeCadhttp://sourceforge.net/projects/free‐cad/
S-PlusRhttp://cran.r‐project.org/bin/GPLStatistics
Operating SystemGNU/LINUXhttp://www.bosslinux.in/GPLOperating System

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