Algebra`PolynomialContinuedFractions` was available as an add-on package in previous versions of Mathematica and is now available on the web at ...
Algebra`ReIm` was available as an add-on package in previous versions of Mathematica and is now available on the web at library.wolfram.com/infocenter/MathSource/6759.
DiscreteMath`Tree` was available as an add-on package in previous versions of Mathematica and is now available on the web at library.wolfram.com/infocenter/MathSource/6764.
All of the functionality in Graphics`PlotField3D` has been added to the built-in Mathematica kernel.
Graphics`ThreeScript` was available as an add-on package in previous versions of Mathematica and is now available on the web at library.wolfram.com/infocenter/MathSource/6769.
Miscellaneous`RealOnly` was available as an add-on package in previous versions of Mathematica and is now available on the web at ...
The functionality of FactorIntegerECM can be obtained using the enhanced Mathematica kernel function FactorInteger.
NumberTheory`Rationalize` was available as an add-on package in previous versions of Mathematica and is now available on the web at ...
NumericalMath`IntervalRoots` was available as an add-on package in previous versions of Mathematica and is now available on the web at ...
NumericalMath`PolynomialFit` was available as an add-on package in previous versions of Mathematica and is now available on the web at ...