Biology, Chemistry:
Bedtools: Genomic Arithmetic (Linux, Mac, Win)
Bioclipse: Life Sciences (Linux, Mac, Win)
Bioconductor (Manuals): Genomic (Linux, Mac, Win)
Biojava: Tools for Processing Data (Linux, Mac, Win)
Bioperl: Biology (Linux, Mac, Win)
Biopython: Tools for Computation (Linux, Mac, Win)
Blast: Biology Sequences (Linux, Mac, Win)
Crustal Omega: Sequence Align (Linux, Mac, Win)
geWorkbench: Integrated Genomic Data Analysis
Gromacs: Chemistry (Linux, Mac, Win)
Emboss: Biology (Linux, Mac, Win)
IGV: Visualization Genome Browser (Linux, Mac, Win)
Intermnine: Data Integration
Jmol: Chem Structures (Linux, Mac, Win)
Kitware: Chemistry (Linux, Mac, Win)
OpenChemisty (Linux, Mac, Win)
Taverna Workbench: Bio (Linux, Mac, Win)
TheRealFishTracker: Fish Tracker
Ugene: Bioinformatics Software (Linux, Mac, Win)
Bedtools: Genomic Arithmetic (Linux, Mac, Win)
Bioclipse: Life Sciences (Linux, Mac, Win)
Bioconductor (Manuals): Genomic (Linux, Mac, Win)
Biojava: Tools for Processing Data (Linux, Mac, Win)
Bioperl: Biology (Linux, Mac, Win)
Biopython: Tools for Computation (Linux, Mac, Win)
Blast: Biology Sequences (Linux, Mac, Win)
Crustal Omega: Sequence Align (Linux, Mac, Win)
geWorkbench: Integrated Genomic Data Analysis
Gromacs: Chemistry (Linux, Mac, Win)
Emboss: Biology (Linux, Mac, Win)
IGV: Visualization Genome Browser (Linux, Mac, Win)
Intermnine: Data Integration
Jmol: Chem Structures (Linux, Mac, Win)
Kitware: Chemistry (Linux, Mac, Win)
OpenChemisty (Linux, Mac, Win)
Taverna Workbench: Bio (Linux, Mac, Win)
TheRealFishTracker: Fish Tracker
Ugene: Bioinformatics Software (Linux, Mac, Win)
Math:
Freemath: See Matlab (Linux, Mac, Win)
Fusioncharts: Charts, Graphs (Linux, Mac, Win)
Eigen: Algebra, Matrices (Linux, Mac, Win)
Genius See Matlab (Linux, Mac)
Graphviz: Graph Visualization (Linux, Mac)
Maxima: Computer Algebra (Linux, Mac, Win)
NumPy: Scientific Computing(Linux, Mac, Win)
Octave: See Matlab (Linux, Mac, Win)
Qalculate:Calculator (Linux)
Sagemath: See Matlab (Linux, Mac, Win)
Scilab: See Matlab (Linux, Mac, Win)
Speedcrunch: Calculator (Linux, Mac, Win)
Sympy: symbolic Math (Linux, Mac, Win)
Tulip: Graphing (Linux, Win)
4 Alternatives to Matlab (Linux, Mac, Win)
6 Fractual Tools for Mathematics (Linux, Mac, Win)
8 Best Geometry Apps (Linux, Mac, Win)
42 of the Best Scientific Apps (Linux, Mac, Win)
Freemath: See Matlab (Linux, Mac, Win)
Fusioncharts: Charts, Graphs (Linux, Mac, Win)
Eigen: Algebra, Matrices (Linux, Mac, Win)
Genius See Matlab (Linux, Mac)
Graphviz: Graph Visualization (Linux, Mac)
Maxima: Computer Algebra (Linux, Mac, Win)
NumPy: Scientific Computing(Linux, Mac, Win)
Octave: See Matlab (Linux, Mac, Win)
Qalculate:Calculator (Linux)
Sagemath: See Matlab (Linux, Mac, Win)
Scilab: See Matlab (Linux, Mac, Win)
Speedcrunch: Calculator (Linux, Mac, Win)
Sympy: symbolic Math (Linux, Mac, Win)
Tulip: Graphing (Linux, Win)
4 Alternatives to Matlab (Linux, Mac, Win)
6 Fractual Tools for Mathematics (Linux, Mac, Win)
8 Best Geometry Apps (Linux, Mac, Win)
42 of the Best Scientific Apps (Linux, Mac, Win)
Physics:
CompHep: Compuations (Linux, Mac, Win)
Elmer: Multiphysical (Linux, Mac, Win)
Geant4: Particles (Linux, Mac, Win)
Gerrus: Numerical (Linux, Mac, Win)
McStas: Neutron Ray (Linux, Mac, Win)
Openphysics (Linux, Mac, Win)
Root: High-Energy Analysis (Linux)
Step: Interactive (Linux, Mac, Win)
10 Best Physics Tools (Linux, Mac, Win)
Robotics:
Peekabot: 3-D Visualization (Linux)
5 Best Robotic Apps (Linux, Mac, Win)
CompHep: Compuations (Linux, Mac, Win)
Elmer: Multiphysical (Linux, Mac, Win)
Geant4: Particles (Linux, Mac, Win)
Gerrus: Numerical (Linux, Mac, Win)
McStas: Neutron Ray (Linux, Mac, Win)
Openphysics (Linux, Mac, Win)
Root: High-Energy Analysis (Linux)
Step: Interactive (Linux, Mac, Win)
10 Best Physics Tools (Linux, Mac, Win)
Robotics:
Peekabot: 3-D Visualization (Linux)
5 Best Robotic Apps (Linux, Mac, Win)