Just wanted to see a few. R has such a strong Fortran code base that I knew that they needed to be in R somewhere.<p>Molecular Dynamic - <a href="https:&#x2F;&#x2F;cran.r-project.org&#x2F;web&#x2F;packages&#x2F;bio3d&#x2F;index.html" rel="nofollow">https:&#x2F;&#x2F;cran.r-project.org&#x2F;web&#x2F;packages&#x2F;bio3d&#x2F;index.html</a><p>computational fluid dynamics - <a href="http:&#x2F;&#x2F;search.r-project.org&#x2F;library&#x2F;rjacobi&#x2F;html&#x2F;xinterp.html" rel="nofollow">http:&#x2F;&#x2F;search.r-project.org&#x2F;library&#x2F;rjacobi&#x2F;html&#x2F;xinterp.htm...</a><p>finite element method - <a href="https:&#x2F;&#x2F;cran.r-project.org&#x2F;web&#x2F;packages&#x2F;RTriangle&#x2F;RTriangle.pdf" rel="nofollow">https:&#x2F;&#x2F;cran.r-project.org&#x2F;web&#x2F;packages&#x2F;RTriangle&#x2F;RTriangle....</a><p>Poisson - <a href="https:&#x2F;&#x2F;cran.r-project.org&#x2F;web&#x2F;packages&#x2F;isotone&#x2F;isotone.pdf" rel="nofollow">https:&#x2F;&#x2F;cran.r-project.org&#x2F;web&#x2F;packages&#x2F;isotone&#x2F;isotone.pdf</a>