  We give expressions for all generalized polylogarithms up to weight four in
terms of the functions log, $\text{Li}_n$, and $\text{Li}_{2,2}$, valid for
arbitrary complex variables. Furthermore we provide algorithms for manipulation
and numerical evaluation of $\text{Li}_n$ and $\text{Li}_{2,2}$, and add codes
in Mathematica and C++ implementing the results. With these results we
calculate a number of previously unknown integrals, which we add in App. C.
