Free and Open Source alternatives for commercial softwares

Commercial Software Similar Opensource Download Link License Used where
MATLAB Scilab CeCILL Engineering (Electrical, Mechanical, Civil, Electronics, Embedded systems, Chemical), Science (Physics, Mathematics)
Mathematica Maxima GPL Mathematics, Engineering
Cadence pSpice ngspice BSD Engineering (Electrical, Electronics, Embedded systems)
Microsoft Office Open office LGPL All branches
Microsoft Office LaTeX http://www.latex‐ LPPL All branches
Mathematica/Maple Sage GPL Precise arithmetic, algebra, symbolic computation
Microsoft Windows GNU/Linux GPL All branches
Turbo C GCC GPL Engineering (Introductory Computing – all branches)
Pro/E BRL-CAD BSD Engineering (CAD)
BSD, BSD Engineering (Electronics, Computer Science)
MS OFFICE Plotting tools Xmgrace, XFIG, GNUPLOT
BSD, GPL, Own license (but free) Drawing the figures, plots, flow diagrams
Code composer Studio, IAR Workbench GNU Binutils GPL Assembler, Compilers for micro controllers and DSP Processors (MSP, VC33 etc)
GPL, GPL/LGPL (kernel and user space respectively), Real-time operating System for Desktop and Embedded Systems
KEIL 8051 SDCC GPL GCC SDCC compiler for 8051 controlers
synopsis-CosmosSE, Mentor-Icstudio, Cadence-Virtuoso Xcircuit GPL schematic design
Mentor-ICstation, Cadence-Virtuoso Magic BSD Used for chip Layout design
Modelsim ghdl, freehdl
GPL VHDL compiler
Matlab Octave GPL Numerical Computation
AutoCad KiCad, GPL CAD system
S-Plus R http://cran.r‐ GPL Statistics
Operating System GNU/LINUX GPL Operating System

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