\input zb-basic \input zb-ioport \iteman{io-port 05732348} \itemau{Kolev, Tzanio V.; Vassilevski, Panayot S.} \itemti{Parallel auxiliary space AMG for $\boldsymbol{H}$ (curl) problems.} \itemso{J. Comput. Math. 27, No. 5, 604-623 (2009).} \itemab Summary: We review a number of auxiliary space based preconditioners for second order definite and semi-definite Maxwell problems discretized with the lowest order N\'{e}d\'{e}lec finite elements. We discuss the parallel implementation of the most promising of these methods, the ones derived from the recent auxiliary space decomposition by {\it R. Hiptmair} and {\it J. Xu} [SIAM J. Numer. Anal., 45, No.~6, 2483--2509 (2007; Zbl 1153.78006)]. An extensive set of numerical experiments demonstrate the scalability of our implementation on large-scale $\boldsymbol{H}$ (curl) problems. \itemrv{~} \itemcc{} \itemut{parallel algebraic multigrid; $\boldsymbol{H}$ (curl) problems; edge elements; auxiliary space preconditioning} \itemli{doi:10.4208/jcm.2009.27.5.013} \end