../../f_src/intlib/intlib.html">
      INTLIB</a>,
      a FORTRAN90 library which
      can estimate the integral of a function.
    </p>

    <p>
      <a href = "../../f_src/quadpack/quadpack.html">
      QUADPACK</a>,
      a FORTRAN90 library which
      can estimate the integral of a function,
      including weight functions, singularities, and infinite intervals.
    </p>

    <p>
      <a href = "../../f_src/quadrule/quadrule.html">
      QUADRULE</a>,
      a FORTRAN90 library which
      defines 