$BenchmarkSystems gives the names of systems for which the MathematicaMark8 benchmark data is known.

EasterSundayGreekOrthodox[year] gives the date of Easter Sunday according to the Greek Orthodox Church using the Gregorian system.

EasterSunday[year] gives the date of Easter Sunday in the Gregorian calendar system.

ApproximateVertexCover[g] produces a vertex cover of graph g whose size is guaranteed to be within twice the optimal size.

Automorphisms[g] gives the automorphism group of the graph g.

Cofactor[m, {i, j}] calculates the (i, j)\[Null]^th cofactor of matrix m.

CostOfPath[g, p] sums up the weights of the edges in graph g defined by the path p.

CyclicGroup[n] returns the cyclic group of permutations on n symbols.

Degrees[g] returns the degrees of vertex 1, 2, 3, ... in that order.

Derangements[p] constructs all derangements of permutation p.