Research software

• ELATE: Elastic tensor analysis — my online open-source tool for analysis of elastic tensors, calculating elastic properties of materials.
• My scripts/tools for scientific writing, LaTeX, and computational chemistry are available on GitHub.

GNU Fortran

I provide GNU Fortran packages for macOS (for more details, see these explanations):

• gfortran 6.3 for Sierra (macOS 10.12)
• gfortran 6.1 for El Capitan (OS X 10.11)
• gfortran 5.2 for Yosemite (OS X 10.10) and later (works well with El Capitan, OS X 10.11)
• gfortran 4.9.2 for Yosemite (OS X 10.10)
• gfortran 4.9.0 for Mavericks (OS X 10.9)
• gfortran 4.8.2 for Mavericks (OS X 10.9), Mountain Lion (10.8) or Lion (10.7)

Another installation method is to use the Homebrew package manager, to install GCC and a lot more open source software. I am a maintainer of Homebrew.