  This article summarizes new features and enhancements of the first major
update of Package-X. Package-X 2.0 can now generate analytic expressions for
arbitrarily high rank dimensionally regulated tensor integrals with up to four
distinct propagators, each with arbitrary integer weight, near an arbitrary
even number of spacetime dimensions, giving UV divergent, IR divergent, and
finite parts at (almost) any real-valued kinematic point. Additionally, it can
generate multivariable Taylor series expansions of these integrals around any
non-singular kinematic point to arbitrary order. All special functions and
abbreviations output by Package-X 2.0 supports Mathematica's arbitrary
precision evaluation capabilities to deal with issues of numerical stability.
Finally, tensor algebraic routines of Package-X have been polished and extended
to support open fermion chains both on and off shell. The documentation
(equivalent to over 100 printed pages) is accessed through Mathematica's
Wolfram Documentation Center and contains information on all Package-X symbols,
with over 300 basic usage examples, 3 project-scale tutorials, and instructions
on linking to FeynCalc and LoopTools.
